diff --git a/lib/math.js b/lib/math.js
index 9c281e355..6eb0c7484 100644
--- a/lib/math.js
+++ b/lib/math.js
@@ -62,14 +62,15 @@ if (typeof(window) != 'undefined') {
 
 var PRECISION = 1E10;
 
+var util = {};
+
 /**
  * Convert a number to a formatted string representation
  * @param {Number} value            The value to be formatted
  * @param {Number} [digits]         number of digits
  * @return {String} formattedValue  The formatted value
- * @private
  */
-var format = function (value, digits) {
+util.format = function (value, digits) {
     if (value === Infinity) {
         return 'Infinity';
     }
@@ -84,13 +85,13 @@ var format = function (value, digits) {
     var abs = Math.abs(value);
     if ( (abs > 0.0001 && abs < 1000000) || abs == 0.0 ) {
         // round the func to a limited number of digits
-        return String(round(value, digits));
+        return String(util.round(value, digits));
     }
     else {
         // scientific notation
         var exp = Math.round(Math.log(abs) / Math.LN10);
         var v = value / (Math.pow(10.0, exp));
-        return round(v, digits) + 'E' + exp;
+        return util.round(v, digits) + 'E' + exp;
     }
 };
 
@@ -100,9 +101,8 @@ var format = function (value, digits) {
  * @param {Number} value
  * @param {Number} [digits]
  * @return {Number} roundedValue
- * @private
  */
-var round = function (value, digits) {
+util.round = function (value, digits) {
     digits = (digits != undefined) ? Math.pow(10, digits) : PRECISION;
 
     return Math.round(value * digits) / digits;
@@ -112,9 +112,8 @@ var round = function (value, digits) {
  * Create a semi UUID
  * source: http://stackoverflow.com/a/105074/1262753
  * @return {String} uuid
- * @private
  */
-var createUUID = function () {
+util.createUUID = function () {
     var S4 = function () {
         return Math.floor(
             Math.random() * 0x10000 /* 65536 */
@@ -335,7 +334,7 @@ Unit.prototype.hasBase = function(base) {
 
 /**
  * Check if this unit has a base equal to another base
- * @param {math.type.Unit} other
+ * @param {Unit} other
  * @return {Boolean} true if equal base
  */
 Unit.prototype.equalBase = function(other) {
@@ -356,6 +355,7 @@ Unit.prototype.equals = function(other) {
  * @return {String}
  */
 Unit.prototype.toString = function() {
+    var value;
     if (!this.fixPrefix) {
         // find the best prefix value (resulting in the value of which
         // the absolute value of the log10 is closest to zero,
@@ -383,12 +383,12 @@ Unit.prototype.toString = function() {
             }
         }
 
-        var value = this._unnormalize(this.value, bestPrefix.value);
-        return format(value) + ' ' + bestPrefix.name + this.unit.name;
+        value = this._unnormalize(this.value, bestPrefix.value);
+        return util.format(value) + ' ' + bestPrefix.name + this.unit.name;
     }
     else {
-        var value = this._unnormalize(this.value);
-        return format(value) + ' ' + this.prefix.name + this.unit.name;
+        value = this._unnormalize(this.value);
+        return util.format(value) + ' ' + this.prefix.name + this.unit.name;
     }
 };
 
@@ -706,7 +706,7 @@ Complex.prototype.toString = function () {
 
     if (this.im === 0) {
         // real value
-        str = format(this.re);
+        str = util.format(this.re);
     }
     else if (this.re === 0) {
         // purely complex value
@@ -717,25 +717,25 @@ Complex.prototype.toString = function () {
             str = '-i';
         }
         else {
-            str = format(this.im) + 'i';
+            str = util.format(this.im) + 'i';
         }
     }
     else {
         // complex value
         if (this.im > 0) {
             if (this.im == 1) {
-                str = format(this.re) + ' + i';
+                str = util.format(this.re) + ' + i';
             }
             else {
-                str = format(this.re) + ' + ' + format(this.im) + 'i';
+                str = util.format(this.re) + ' + ' + util.format(this.im) + 'i';
             }
         }
         else {
             if (this.im == -1) {
-                str = format(this.re) + ' - i';
+                str = util.format(this.re) + ' - i';
             }
             else {
-                str = format(this.re) + ' - ' + format(Math.abs(this.im)) + 'i';
+                str = util.format(this.re) + ' - ' + util.format(Math.abs(this.im)) + 'i';
             }
         }
     }
@@ -853,19 +853,28 @@ math.i         = math.I;
  * Create a TypeError with message:
  *      'Function <fn> does not support a parameter of type <type>';
  * @param {String} fn
- * @param {*} value
+ * @param {*} value1
+ * @param {*} [value2]
  * @return {TypeError | Error} error
  */
-function newUnsupportedTypeError(fn, value) {
-    var t = type(value);
-    var msg = 'Function ' + fn + ' does not support a parameter of type ' + t;
-
-    if ((typeof TypeError) != 'undefined') {
-        return new TypeError(msg);
+function newUnsupportedTypeError(fn, value1, value2) {
+    var msg = undefined;
+    if (arguments.length == 2) {
+        var t = type(value1);
+        msg = 'Function ' + fn + ' does not support a parameter of type ' + t;
+    }
+    else if (arguments.length > 2) {
+        var types = [];
+        for (var i = 1; i < arguments.length; i++) {
+            types += type(arguments[i])
+        }
+        msg = 'Function ' + fn + ' does not support a parameters of type ' + types.join(', ');
     }
     else {
-        return new Error(msg);
+        msg = 'Unsupported parameter in function ' + fn;
     }
+
+    return new TypeError(msg);
 }
 
 /**
@@ -875,7 +884,7 @@ function newUnsupportedTypeError(fn, value) {
  * @return {Unit} res
  */
 function unit_in(x, unit) {
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         // Test if unit has no value
         if (unit.hasValue) {
             throw new Error('Cannot convert to a unit with a value');
@@ -936,7 +945,7 @@ function sin(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function cos is no angle');
         }
@@ -975,9 +984,66 @@ sin.doc = {
     ]
 };
 
+/**
+ * Computes the principal value of the arc tangent of y/x in radians, atan2(y,x)
+ * @param {Number | Complex} y
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function atan2(y, x) {
+    if (isNumber(y)) {
+        if (isNumber(x)) {
+            return Math.atan2(y, x);
+        }
+        else if (x instanceof Complex) {
+            return Math.atan2(y, x.re);
+        }
+    }
+    else if (y instanceof Complex) {
+        if (isNumber(x)) {
+            return Math.atan2(y.re, x);
+        }
+        else if (x instanceof Complex) {
+            return Math.atan2(y.re, x.re);
+        }
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('atan2', y, x);
+}
+
+math.atan2 = atan2;
+
+/**
+ * Function documentation
+ */
+atan2.doc = {
+    'name': 'atan2',
+    'category': 'Trigonometry',
+    'syntax': [
+        'atan2(y, x)'
+    ],
+    'description':
+        'Computes the principal value of the arc tangent of y/x in radians.',
+    'examples': [
+        'atan2(2, 2) / pi',
+        'angle = 60 deg in rad',
+        'x = cos(angle)',
+        'y = sin(angle)',
+        'atan2(y, x)'
+    ],
+    'seealso': [
+        'sin',
+        'cos',
+        'tan'
+    ]
+};
+
 /**
  * Calculate the inverse sine of a value, asin(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function asin(x) {
@@ -1041,7 +1107,7 @@ asin.doc = {
 
 /**
  * Calculate the inverse tangent of a value, atan(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function atan(x) {
@@ -1114,7 +1180,7 @@ function cos(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function cos is no angle');
         }
@@ -1174,7 +1240,7 @@ function tan(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function tan is no angle');
         }
@@ -1214,7 +1280,7 @@ tan.doc = {
 
 /**
  * Calculate the inverse cosine of a value, acos(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function acos(x) {
@@ -1276,6 +1342,135 @@ acos.doc = {
     ]
 };
 
+/**
+ * Round a value towards the nearest integer, round(x [, n])
+ * @param {Number | Complex} x
+ * @param {Number} [n] number of digits
+ * @return {Number | Complex} res
+ */
+function round(x, n) {
+    if (n == undefined) {
+        // round (x)
+        if (isNumber(x)) {
+            return Math.round(x);
+        }
+
+        if (x instanceof Complex) {
+            return new Complex (
+                Math.round(x.re),
+                Math.round(x.im)
+            );
+        }
+
+        throw newUnsupportedTypeError('round', x);
+    }
+    else {
+        // round (x, n)
+        if (!isNumber(n)) {
+            throw new TypeError('Number of digits in function round must be an integer');
+        }
+        if (n !== Math.round(n)) {
+            throw new TypeError('Number of digits in function round must be integer');
+        }
+        if (n < 0 || n > 9) {
+            throw new Error ('Number of digits in function round must be in te range of 0-9');
+        }
+
+        if (isNumber(x)) {
+            return util.round(x, n);
+        }
+
+        if (x instanceof Complex) {
+            return new Complex (
+                util.round(x.re, n),
+                util.round(x.im, n)
+            );
+        }
+
+        throw newUnsupportedTypeError('round', x, n);
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+}
+
+
+math.round = round;
+
+/**
+ * Function documentation
+ */
+round.doc = {
+    'name': 'round',
+    'category': 'Arithmetic',
+    'syntax': [
+        'round(x)',
+        'round(x, n)'
+    ],
+    'description':
+        'round a value towards the nearest integer.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards the nearest integer. ' +
+            'When n is specified, the value is rounded to n decimals.',
+    'examples': [
+        'round(3.2)',
+        'round(3.8)',
+        'round(-4.2)',
+        'round(-4.8)',
+        'round(pi, 3)',
+        'round(123.45678, 2)'
+    ],
+    'seealso': ['ceil', 'floor', 'fix']
+};
+
+/**
+ * Round a value towards zero, fix(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function fix(x) {
+    if (isNumber(x)) {
+        return (value > 0) ? Math.floor(x) : Math.ceil(x);
+    }
+
+    if (x instanceof Complex) {
+        new Complex(
+            (x.re > 0) ? Math.floor(x.re) : Math.ceil(x.re),
+            (x.im > 0) ? Math.floor(x.im) : Math.ceil(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('fix', x);
+}
+
+math.fix = fix;
+
+/**
+ * Function documentation
+ */
+fix.doc = {
+    'name': 'fix',
+    'category': 'Arithmetic',
+    'syntax': [
+        'fix(x)'
+    ],
+    'description':
+        'Round a value towards zero.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards zero.',
+    'examples': [
+        'fix(3.2)',
+        'fix(3.8)',
+        'fix(-4.2)',
+        'fix(-4.8)'
+    ],
+    'seealso': ['ceil', 'floor', 'round']
+};
+
 /**
  * Calculate the exponent of a value, exp(x)
  * @param {Number | Complex} x
@@ -1479,5 +1674,126 @@ log.doc = {
     ]
 };
 
+/**
+ * Round a value towards minus infinity, floor(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function floor(x) {
+    if (isNumber(x)) {
+        return Math.floor(x);
+    }
+
+    if (x instanceof Complex) {
+        return new Complex (
+            Math.floor(x.re),
+            Math.floor(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('floor', x);
+}
+
+math.floor = floor;
+
+/**
+ * Function documentation
+ */
+floor.doc = {
+    'name': 'floor',
+    'category': 'Arithmetic',
+    'syntax': [
+        'floor(x)'
+    ],
+    'description':
+        'Round a value towards minus infinity.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards minus infinity.',
+    'examples': [
+        'floor(3.2)',
+        'floor(3.8)',
+        'floor(-4.2)'
+    ],
+    'seealso': ['ceil', 'fix', 'round']
+};
+
+/**
+ * Round a value towards plus infinity, ceil(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function ceil(x) {
+    if (isNumber(x)) {
+        return Math.ceil(x);
+    }
+
+    if (x instanceof Complex) {
+        return new Complex (
+            Math.ceil(x.re),
+            Math.ceil(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('ceil', x);
+}
+
+math.ceil = ceil;
+
+/**
+ * Function documentation
+ */
+ceil.doc = {
+    'name': 'ceil',
+    'category': 'Arithmetic',
+    'syntax': [
+        'ceil(x)'
+    ],
+    'description':
+        'Round a value towards plus infinity.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards plus infinity.',
+    'examples': [
+        'ceil(3.2)',
+        'ceil(3.8)',
+        'ceil(-4.2)'
+    ],
+    'seealso': ['floor', 'fix', 'round']
+};
+
+/**
+ * Return a random number between 0 and 1
+ * @return {Number} res
+ */
+function random () {
+    // TODO: implement parameter min and max
+    return Math.random();
+}
+
+math.random = random;
+
+/**
+ * Function documentation
+ */
+random.doc = {
+    'name': 'random',
+    'category': 'Probability',
+    'syntax': [
+        'random()'
+    ],
+    'description':
+        'Return a random number between 0 and 1.',
+    'examples': [
+        'random()',
+        '100 * random()'
+    ],
+    'seealso': []
+};
+
 
 })();
diff --git a/lib/math.min.js b/lib/math.min.js
index 20cdffd64..68f70ce3f 100644
--- a/lib/math.min.js
+++ b/lib/math.min.js
@@ -22,4 +22,4 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-(function(){function e(a,i){if(this.constructor!=e)throw Error("Unit constructor must be called with the new operator");this.value=1,this.unit=e.UNIT_NONE,this.prefix=e.PREFIX_NONE,this.hasUnit=!1,this.hasValue=!1,this.fixPrefix=!1,this._init(a,i)}function a(e,i){if(this.constructor!=a)throw Error("Complex constructor must be called with the new operator");this.re=e||0,this.im=i||0}function i(e){return e instanceof Number||"number"==typeof e}function t(a){return a instanceof e}function n(e){var a=typeof e;if("object"==a){if(null==e)return"null";if(e instanceof Array)return"array";if(e&&e.constructor&&e.constructor.name)return e.constructor.name}return a}function s(e,a){var i=n(a),t="Function "+e+" does not support a parameter of type "+i;return"undefined"!=typeof TypeError?new TypeError(t):Error(t)}function f(e,a){if(t(e)){if(a.hasValue)throw Error("Cannot convert to a unit with a value");if(!a.hasUnit)throw Error("Unit expected on the right hand side of function in");var i=a.copy();return i.value=e.value,i.fixPrefix=!0,i}throw s("in",e)}function r(n){if(i(n))return Math.sin(n);if(n instanceof a)return new a(.5*Math.sin(n.re)*(Math.exp(-n.im)+Math.exp(n.im)),.5*Math.cos(n.re)*(Math.exp(n.im)-Math.exp(-n.im)));if(t(n)){if(!n.hasBase(e.BASE_UNITS.ANGLE))throw new TypeError("Unit in function cos is no angle");return Math.sin(n.value)}throw s("sin",n)}function o(e){if(i(e))return e>=-1&&1>=e?Math.asin(e):o(new a(e,0));if(e instanceof a){var t=e.re,n=e.im,f=new a(n*n-t*t+1,-2*t*n),r=N(f),u=new a(r.re-n,r.im+t),c=h(u);return new a(c.im,-c.re)}throw s("asin",e)}function u(e){if(i(e))return Math.atan(e);if(e instanceof a){var t=e.re,n=e.im,f=t*t+(1-n)*(1-n),r=new a((1-n*n-t*t)/f,-2*t/f),o=h(r);return new a(-.5*o.im,.5*o.re)}throw s("atan",e)}function c(n){if(i(n))return Math.cos(n);if(n instanceof a)return new a(.5*Math.cos(n.re)*(Math.exp(-n.im)+Math.exp(n.im)),.5*Math.sin(n.re)*(Math.exp(-n.im)-Math.exp(n.im)));if(t(n)){if(!n.hasBase(e.BASE_UNITS.ANGLE))throw new TypeError("Unit in function cos is no angle");return Math.cos(n.value)}throw s("cos",n)}function l(n){if(i(n))return Math.tan(n);if(n instanceof a){var f=Math.exp(-4*n.im)+2*Math.exp(-2*n.im)*Math.cos(2*n.re)+1;return new a(2*Math.exp(-2*n.im)*Math.sin(2*n.re)/f,(1-Math.exp(-4*n.im))/f)}if(t(n)){if(!n.hasBase(e.BASE_UNITS.ANGLE))throw new TypeError("Unit in function tan is no angle");return Math.tan(n.value)}throw s("tan",n)}function m(e){if(i(e))return e>=-1&&1>=e?Math.acos(e):m(new a(e,0));if(e instanceof a){var t=new a(e.im*e.im-e.re*e.re+1,-2*e.re*e.im),n=N(t),f=new a(n.re-e.im,n.im+e.re),r=h(f);return new a(1.5707963267948966-r.im,r.re)}throw s("acos",e)}function p(e){if(i(e))return Math.exp(e);if(e instanceof a){var t=Math.exp(e.re);return new a(t*Math.cos(e.im),t*Math.sin(e.im))}throw s("exp",e)}function N(e){if(i(e))return e>=0?Math.sqrt(e):N(new a(e,0));if(e instanceof a){var t=Math.sqrt(e.re*e.re+e.im*e.im);return e.im>=0?new a(.5*Math.sqrt(2*(t+e.re)),.5*Math.sqrt(2*(t-e.re))):new a(.5*Math.sqrt(2*(t+e.re)),-.5*Math.sqrt(2*(t-e.re)))}throw s("sqrt",e)}function v(e){if(i(e))return Math.abs(e);if(e instanceof a)return Math.sqrt(e.re*e.re+e.im*e.im);throw s("abs",e)}function h(e){if(i(e))return e>=0?Math.log(e):h(new a(e,0));if(e instanceof a)return new a(Math.log(Math.sqrt(e.re*e.re+e.im*e.im)),Math.atan2(e.im,e.re));throw s("log",e)}var E={type:{},parser:{}};"undefined"!=typeof module&&module.exports!==void 0&&(module.exports=E),"undefined"!=typeof exports&&(exports=E),"undefined"!=typeof require&&"undefined"!=typeof define&&define(function(){return E}),"undefined"!=typeof window&&(window.math=E);var x=1e10,M=function(e,a){if(1/0===e)return"Infinity";if(e===-1/0)return"-Infinity";if(0/0===e)return"NaN";var i=Math.abs(e);if(i>1e-4&&1e6>i||0==i)return O(e,a)+"";var t=Math.round(Math.log(i)/Math.LN10),n=e/Math.pow(10,t);return O(n,a)+"E"+t},O=function(e,a){return a=void 0!=a?Math.pow(10,a):x,Math.round(e*a)/a};if(!Array.prototype.indexOf){Array.prototype.indexOf=function(e){for(var a=0;this.length>a;a++)if(this[a]==e)return a;return-1};try{console.log("Warning: Ancient browser detected. 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new a(this.re,this.im)},a.prototype.toString=function(){var e="";return e=0===this.im?y.format(this.re):0===this.re?1===this.im?"i":-1===this.im?"-i":y.format(this.im)+"i":this.im>0?1==this.im?y.format(this.re)+" + i":y.format(this.re)+" + "+y.format(this.im)+"i":-1==this.im?y.format(this.re)+" - i":y.format(this.re)+" - "+y.format(Math.abs(this.im))+"i"},a.doc={name:"Complex",category:"type",syntax:["a + bi","a + b * i"],description:"A complex value a + bi, where a is the real part and b is the complex part, and i is the imaginary number defined as sqrt(-1).",examples:["2 + 3i","sqrt(-4)","(1.2 -5i) * 2"],seealso:["abs","arg","conj","im","re"]},O.E=Math.E,O.LN2=Math.LN2,O.LN10=Math.LN10,O.LOG2E=Math.LOG2E,O.LOG10E=Math.LOG10E,O.PI=Math.PI,O.SQRT1_2=Math.SQRT1_2,O.SQRT2=Math.SQRT2,O.I=new a(0,-1),O.pi=O.PI,O.e=O.E,O.i=O.I,O["in"]=s,s.doc={name:"in",category:"Units",syntax:["x in unit","in(x, unit)"],description:"Change the unit of a value.",examples:["5 inch in cm","3.2kg in g","16 bytes in bits"],seealso:[]},O.sin=r,r.doc={name:"sin",category:"Trigonometry",syntax:["sin(x)"],description:"Compute the sine of x in radians.",examples:["sin(2)","sin(pi / 4) ^ 2","sin(90 deg)","sin(30 deg)","sin(0.2)^2 + cos(0.2)^2"],seealso:["asin","cos","tan"]},O.atan2=o,o.doc={name:"atan2",category:"Trigonometry",syntax:["atan2(y, x)"],description:"Computes the principal value of the arc tangent of y/x in radians.",examples:["atan2(2, 2) / pi","angle = 60 deg in rad","x = cos(angle)","y = sin(angle)","atan2(y, x)"],seealso:["sin","cos","tan"]},O.asin=f,f.doc={name:"asin",category:"Trigonometry",syntax:["asin(x)"],description:"Compute the inverse sine of a value in radians.",examples:["asin(0.5)","asin(sin(2.3))"],seealso:["sin","acos","asin"]},O.atan=u,u.doc={name:"atan",category:"Trigonometry",syntax:["atan(x)"],description:"Compute the inverse tangent of a value in radians.",examples:["atan(0.5)","atan(tan(2.3))"],seealso:["tan","acos","asin"]},O.cos=c,c.doc={name:"cos",category:"Trigonometry",syntax:["cos(x)"],description:"Compute the cosine of x in radians.",examples:["cos(2)","cos(pi / 4) ^ 2","cos(180 deg)","cos(60 deg)","sin(0.2)^2 + cos(0.2)^2"],seealso:["acos","sin","tan"]},O.tan=l,l.doc={name:"tan",category:"Trigonometry",syntax:["tan(x)"],description:"Compute the tangent of x in radians.",examples:["tan(0.5)","sin(0.5) / cos(0.5)","tan(pi / 4)","tan(45 deg)"],seealso:["atan","sin","cos"]},O.acos=m,m.doc={name:"acos",category:"Trigonometry",syntax:["acos(x)"],description:"Compute the inverse cosine of a value in radians.",examples:["acos(0.5)","acos(cos(2.3))"],seealso:["cos","acos","asin"]},O.round=p,p.doc={name:"round",category:"Arithmetic",syntax:["round(x)","round(x, n)"],description:"round a value towards the nearest integer.If x is complex, both real and imaginary part are rounded towards the nearest integer. When n is specified, the value is rounded to n decimals.",examples:["round(3.2)","round(3.8)","round(-4.2)","round(-4.8)","round(pi, 3)","round(123.45678, 2)"],seealso:["ceil","floor","fix"]},O.fix=h,h.doc={name:"fix",category:"Arithmetic",syntax:["fix(x)"],description:"Round a value towards zero.If x is complex, both real and imaginary part are rounded towards zero.",examples:["fix(3.2)","fix(3.8)","fix(-4.2)","fix(-4.8)"],seealso:["ceil","floor","round"]},O.exp=v,v.doc={name:"exp",category:"Arithmetic",syntax:["exp(x)"],description:"Calculate the exponent of a value.",examples:["exp(1.3)","e ^ 1.3","log(exp(1.3))","x = 2.4","(exp(i*x) == cos(x) + i*sin(x))   # Euler's formula"],seealso:["square","multiply","log"]},O.sqrt=N,N.doc={name:"sqrt",category:"Arithmetic",syntax:["sqrt(x)"],description:"Compute the square root value. If x = y * y, then y is the square root of x.",examples:["sqrt(25)","5 * 5","sqrt(-1)"],seealso:["square","multiply"]},O.abs=E,E.doc={name:"abs",category:"Arithmetic",syntax:["abs(x)"],description:"Compute the absolute value.",examples:["abs(3.5)","abs(-4.2)"],seealso:["sign"]},O.log=x,x.doc={name:"log",category:"Arithmetic",syntax:["log(x)"],description:"Compute the natural logarithm of a value.",examples:["log(3.5)","a = log(2.4)","exp(a)","log(1000) / log(10)"],seealso:["exp","logb","log10"]},O.floor=d,d.doc={name:"floor",category:"Arithmetic",syntax:["floor(x)"],description:"Round a value towards minus infinity.If x is complex, both real and imaginary part are rounded towards minus infinity.",examples:["floor(3.2)","floor(3.8)","floor(-4.2)"],seealso:["ceil","fix","round"]},O.ceil=M,M.doc={name:"ceil",category:"Arithmetic",syntax:["ceil(x)"],description:"Round a value towards plus infinity.If x is complex, both real and imaginary part are rounded towards plus infinity.",examples:["ceil(3.2)","ceil(3.8)","ceil(-4.2)"],seealso:["floor","fix","round"]},O.random=b,b.doc={name:"random",category:"Probability",syntax:["random()"],description:"Return a random number between 0 and 1.",examples:["random()","100 * random()"],seealso:[]}})();
\ No newline at end of file
diff --git a/src/function/arithmetic/ceil.js b/src/function/arithmetic/ceil.js
new file mode 100644
index 000000000..7be6d8d90
--- /dev/null
+++ b/src/function/arithmetic/ceil.js
@@ -0,0 +1,45 @@
+/**
+ * Round a value towards plus infinity, ceil(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function ceil(x) {
+    if (isNumber(x)) {
+        return Math.ceil(x);
+    }
+
+    if (x instanceof Complex) {
+        return new Complex (
+            Math.ceil(x.re),
+            Math.ceil(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('ceil', x);
+}
+
+math.ceil = ceil;
+
+/**
+ * Function documentation
+ */
+ceil.doc = {
+    'name': 'ceil',
+    'category': 'Arithmetic',
+    'syntax': [
+        'ceil(x)'
+    ],
+    'description':
+        'Round a value towards plus infinity.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards plus infinity.',
+    'examples': [
+        'ceil(3.2)',
+        'ceil(3.8)',
+        'ceil(-4.2)'
+    ],
+    'seealso': ['floor', 'fix', 'round']
+};
diff --git a/src/function/arithmetic/fix.js b/src/function/arithmetic/fix.js
new file mode 100644
index 000000000..eb0f4b50e
--- /dev/null
+++ b/src/function/arithmetic/fix.js
@@ -0,0 +1,46 @@
+/**
+ * Round a value towards zero, fix(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function fix(x) {
+    if (isNumber(x)) {
+        return (value > 0) ? Math.floor(x) : Math.ceil(x);
+    }
+
+    if (x instanceof Complex) {
+        new Complex(
+            (x.re > 0) ? Math.floor(x.re) : Math.ceil(x.re),
+            (x.im > 0) ? Math.floor(x.im) : Math.ceil(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('fix', x);
+}
+
+math.fix = fix;
+
+/**
+ * Function documentation
+ */
+fix.doc = {
+    'name': 'fix',
+    'category': 'Arithmetic',
+    'syntax': [
+        'fix(x)'
+    ],
+    'description':
+        'Round a value towards zero.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards zero.',
+    'examples': [
+        'fix(3.2)',
+        'fix(3.8)',
+        'fix(-4.2)',
+        'fix(-4.8)'
+    ],
+    'seealso': ['ceil', 'floor', 'round']
+};
diff --git a/src/function/arithmetic/floor.js b/src/function/arithmetic/floor.js
new file mode 100644
index 000000000..c81e2040a
--- /dev/null
+++ b/src/function/arithmetic/floor.js
@@ -0,0 +1,45 @@
+/**
+ * Round a value towards minus infinity, floor(x)
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function floor(x) {
+    if (isNumber(x)) {
+        return Math.floor(x);
+    }
+
+    if (x instanceof Complex) {
+        return new Complex (
+            Math.floor(x.re),
+            Math.floor(x.im)
+        );
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('floor', x);
+}
+
+math.floor = floor;
+
+/**
+ * Function documentation
+ */
+floor.doc = {
+    'name': 'floor',
+    'category': 'Arithmetic',
+    'syntax': [
+        'floor(x)'
+    ],
+    'description':
+        'Round a value towards minus infinity.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards minus infinity.',
+    'examples': [
+        'floor(3.2)',
+        'floor(3.8)',
+        'floor(-4.2)'
+    ],
+    'seealso': ['ceil', 'fix', 'round']
+};
diff --git a/src/function/arithmetic/round.js b/src/function/arithmetic/round.js
new file mode 100644
index 000000000..dacb22082
--- /dev/null
+++ b/src/function/arithmetic/round.js
@@ -0,0 +1,81 @@
+/**
+ * Round a value towards the nearest integer, round(x [, n])
+ * @param {Number | Complex} x
+ * @param {Number} [n] number of digits
+ * @return {Number | Complex} res
+ */
+function round(x, n) {
+    if (n == undefined) {
+        // round (x)
+        if (isNumber(x)) {
+            return Math.round(x);
+        }
+
+        if (x instanceof Complex) {
+            return new Complex (
+                Math.round(x.re),
+                Math.round(x.im)
+            );
+        }
+
+        throw newUnsupportedTypeError('round', x);
+    }
+    else {
+        // round (x, n)
+        if (!isNumber(n)) {
+            throw new TypeError('Number of digits in function round must be an integer');
+        }
+        if (n !== Math.round(n)) {
+            throw new TypeError('Number of digits in function round must be integer');
+        }
+        if (n < 0 || n > 9) {
+            throw new Error ('Number of digits in function round must be in te range of 0-9');
+        }
+
+        if (isNumber(x)) {
+            return util.round(x, n);
+        }
+
+        if (x instanceof Complex) {
+            return new Complex (
+                util.round(x.re, n),
+                util.round(x.im, n)
+            );
+        }
+
+        throw newUnsupportedTypeError('round', x, n);
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+}
+
+
+math.round = round;
+
+/**
+ * Function documentation
+ */
+round.doc = {
+    'name': 'round',
+    'category': 'Arithmetic',
+    'syntax': [
+        'round(x)',
+        'round(x, n)'
+    ],
+    'description':
+        'round a value towards the nearest integer.' +
+            'If x is complex, both real and imaginary part are rounded ' +
+            'towards the nearest integer. ' +
+            'When n is specified, the value is rounded to n decimals.',
+    'examples': [
+        'round(3.2)',
+        'round(3.8)',
+        'round(-4.2)',
+        'round(-4.8)',
+        'round(pi, 3)',
+        'round(123.45678, 2)'
+    ],
+    'seealso': ['ceil', 'floor', 'fix']
+};
diff --git a/src/function/probability/random.js b/src/function/probability/random.js
new file mode 100644
index 000000000..9cd49af7a
--- /dev/null
+++ b/src/function/probability/random.js
@@ -0,0 +1,28 @@
+/**
+ * Return a random number between 0 and 1
+ * @return {Number} res
+ */
+function random () {
+    // TODO: implement parameter min and max
+    return Math.random();
+}
+
+math.random = random;
+
+/**
+ * Function documentation
+ */
+random.doc = {
+    'name': 'random',
+    'category': 'Probability',
+    'syntax': [
+        'random()'
+    ],
+    'description':
+        'Return a random number between 0 and 1.',
+    'examples': [
+        'random()',
+        '100 * random()'
+    ],
+    'seealso': []
+};
diff --git a/src/function/trigonometry/acos.js b/src/function/trigonometry/acos.js
index 38bb2bf32..a0b9981c8 100644
--- a/src/function/trigonometry/acos.js
+++ b/src/function/trigonometry/acos.js
@@ -1,6 +1,6 @@
 /**
  * Calculate the inverse cosine of a value, acos(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function acos(x) {
diff --git a/src/function/trigonometry/asin.js b/src/function/trigonometry/asin.js
index d63c11101..c81946e00 100644
--- a/src/function/trigonometry/asin.js
+++ b/src/function/trigonometry/asin.js
@@ -1,6 +1,6 @@
 /**
  * Calculate the inverse sine of a value, asin(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function asin(x) {
diff --git a/src/function/trigonometry/atan.js b/src/function/trigonometry/atan.js
index fc1457043..1d44a3eb1 100644
--- a/src/function/trigonometry/atan.js
+++ b/src/function/trigonometry/atan.js
@@ -1,6 +1,6 @@
 /**
  * Calculate the inverse tangent of a value, atan(x)
- * @param {Number | Complex | Unit} x
+ * @param {Number | Complex} x
  * @return {Number | Complex} res
  */
 function atan(x) {
diff --git a/src/function/trigonometry/atan2.js b/src/function/trigonometry/atan2.js
new file mode 100644
index 000000000..3d1cc64e7
--- /dev/null
+++ b/src/function/trigonometry/atan2.js
@@ -0,0 +1,56 @@
+/**
+ * Computes the principal value of the arc tangent of y/x in radians, atan2(y,x)
+ * @param {Number | Complex} y
+ * @param {Number | Complex} x
+ * @return {Number | Complex} res
+ */
+function atan2(y, x) {
+    if (isNumber(y)) {
+        if (isNumber(x)) {
+            return Math.atan2(y, x);
+        }
+        else if (x instanceof Complex) {
+            return Math.atan2(y, x.re);
+        }
+    }
+    else if (y instanceof Complex) {
+        if (isNumber(x)) {
+            return Math.atan2(y.re, x);
+        }
+        else if (x instanceof Complex) {
+            return Math.atan2(y.re, x.re);
+        }
+    }
+
+    // TODO: implement array support
+    // TODO: implement matrix support
+
+    throw newUnsupportedTypeError('atan2', y, x);
+}
+
+math.atan2 = atan2;
+
+/**
+ * Function documentation
+ */
+atan2.doc = {
+    'name': 'atan2',
+    'category': 'Trigonometry',
+    'syntax': [
+        'atan2(y, x)'
+    ],
+    'description':
+        'Computes the principal value of the arc tangent of y/x in radians.',
+    'examples': [
+        'atan2(2, 2) / pi',
+        'angle = 60 deg in rad',
+        'x = cos(angle)',
+        'y = sin(angle)',
+        'atan2(y, x)'
+    ],
+    'seealso': [
+        'sin',
+        'cos',
+        'tan'
+    ]
+};
diff --git a/src/function/trigonometry/cos.js b/src/function/trigonometry/cos.js
index 68ad0a215..7eb9395f0 100644
--- a/src/function/trigonometry/cos.js
+++ b/src/function/trigonometry/cos.js
@@ -16,7 +16,7 @@ function cos(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function cos is no angle');
         }
diff --git a/src/function/trigonometry/sin.js b/src/function/trigonometry/sin.js
index 86afd1716..5ab9cf1d3 100644
--- a/src/function/trigonometry/sin.js
+++ b/src/function/trigonometry/sin.js
@@ -15,7 +15,7 @@ function sin(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function cos is no angle');
         }
diff --git a/src/function/trigonometry/tan.js b/src/function/trigonometry/tan.js
index e72725f8f..2963b2277 100644
--- a/src/function/trigonometry/tan.js
+++ b/src/function/trigonometry/tan.js
@@ -19,7 +19,7 @@ function tan(x) {
         );
     }
 
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         if (!x.hasBase(Unit.BASE_UNITS.ANGLE)) {
             throw new TypeError ('Unit in function tan is no angle');
         }
diff --git a/src/function/units/in.js b/src/function/units/in.js
index 3c22e759e..849bda95b 100644
--- a/src/function/units/in.js
+++ b/src/function/units/in.js
@@ -5,7 +5,7 @@
  * @return {Unit} res
  */
 function unit_in(x, unit) {
-    if (isUnit(x)) {
+    if (x instanceof Unit) {
         // Test if unit has no value
         if (unit.hasValue) {
             throw new Error('Cannot convert to a unit with a value');
diff --git a/src/functions.js b/src/functions.js
index 3034bc98a..230ca5f63 100644
--- a/src/functions.js
+++ b/src/functions.js
@@ -6,17 +6,26 @@
  * Create a TypeError with message:
  *      'Function <fn> does not support a parameter of type <type>';
  * @param {String} fn
- * @param {*} value
+ * @param {*} value1
+ * @param {*} [value2]
  * @return {TypeError | Error} error
  */
-function newUnsupportedTypeError(fn, value) {
-    var t = type(value);
-    var msg = 'Function ' + fn + ' does not support a parameter of type ' + t;
-
-    if ((typeof TypeError) != 'undefined') {
-        return new TypeError(msg);
+function newUnsupportedTypeError(fn, value1, value2) {
+    var msg = undefined;
+    if (arguments.length == 2) {
+        var t = type(value1);
+        msg = 'Function ' + fn + ' does not support a parameter of type ' + t;
+    }
+    else if (arguments.length > 2) {
+        var types = [];
+        for (var i = 1; i < arguments.length; i++) {
+            types += type(arguments[i])
+        }
+        msg = 'Function ' + fn + ' does not support a parameters of type ' + types.join(', ');
     }
     else {
-        return new Error(msg);
+        msg = 'Unsupported parameter in function ' + fn;
     }
+
+    return new TypeError(msg);
 }
diff --git a/src/type/Complex.js b/src/type/Complex.js
index d5ceb4399..48f9e2d03 100644
--- a/src/type/Complex.js
+++ b/src/type/Complex.js
@@ -39,7 +39,7 @@ Complex.prototype.toString = function () {
 
     if (this.im === 0) {
         // real value
-        str = format(this.re);
+        str = util.format(this.re);
     }
     else if (this.re === 0) {
         // purely complex value
@@ -50,25 +50,25 @@ Complex.prototype.toString = function () {
             str = '-i';
         }
         else {
-            str = format(this.im) + 'i';
+            str = util.format(this.im) + 'i';
         }
     }
     else {
         // complex value
         if (this.im > 0) {
             if (this.im == 1) {
-                str = format(this.re) + ' + i';
+                str = util.format(this.re) + ' + i';
             }
             else {
-                str = format(this.re) + ' + ' + format(this.im) + 'i';
+                str = util.format(this.re) + ' + ' + util.format(this.im) + 'i';
             }
         }
         else {
             if (this.im == -1) {
-                str = format(this.re) + ' - i';
+                str = util.format(this.re) + ' - i';
             }
             else {
-                str = format(this.re) + ' - ' + format(Math.abs(this.im)) + 'i';
+                str = util.format(this.re) + ' - ' + util.format(Math.abs(this.im)) + 'i';
             }
         }
     }
diff --git a/src/type/Unit.js b/src/type/Unit.js
index 41d6e83d7..89a461436 100644
--- a/src/type/Unit.js
+++ b/src/type/Unit.js
@@ -172,7 +172,7 @@ Unit.prototype.hasBase = function(base) {
 
 /**
  * Check if this unit has a base equal to another base
- * @param {math.type.Unit} other
+ * @param {Unit} other
  * @return {Boolean} true if equal base
  */
 Unit.prototype.equalBase = function(other) {
@@ -193,6 +193,7 @@ Unit.prototype.equals = function(other) {
  * @return {String}
  */
 Unit.prototype.toString = function() {
+    var value;
     if (!this.fixPrefix) {
         // find the best prefix value (resulting in the value of which
         // the absolute value of the log10 is closest to zero,
@@ -220,12 +221,12 @@ Unit.prototype.toString = function() {
             }
         }
 
-        var value = this._unnormalize(this.value, bestPrefix.value);
-        return format(value) + ' ' + bestPrefix.name + this.unit.name;
+        value = this._unnormalize(this.value, bestPrefix.value);
+        return util.format(value) + ' ' + bestPrefix.name + this.unit.name;
     }
     else {
-        var value = this._unnormalize(this.value);
-        return format(value) + ' ' + this.prefix.name + this.unit.name;
+        value = this._unnormalize(this.value);
+        return util.format(value) + ' ' + this.prefix.name + this.unit.name;
     }
 };
 
diff --git a/src/util.js b/src/util.js
index 32f45d07f..fb02597b9 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,14 +1,15 @@
 
 var PRECISION = 1E10;
 
+var util = {};
+
 /**
  * Convert a number to a formatted string representation
  * @param {Number} value            The value to be formatted
  * @param {Number} [digits]         number of digits
  * @return {String} formattedValue  The formatted value
- * @private
  */
-var format = function (value, digits) {
+util.format = function (value, digits) {
     if (value === Infinity) {
         return 'Infinity';
     }
@@ -23,13 +24,13 @@ var format = function (value, digits) {
     var abs = Math.abs(value);
     if ( (abs > 0.0001 && abs < 1000000) || abs == 0.0 ) {
         // round the func to a limited number of digits
-        return String(round(value, digits));
+        return String(util.round(value, digits));
     }
     else {
         // scientific notation
         var exp = Math.round(Math.log(abs) / Math.LN10);
         var v = value / (Math.pow(10.0, exp));
-        return round(v, digits) + 'E' + exp;
+        return util.round(v, digits) + 'E' + exp;
     }
 };
 
@@ -39,9 +40,8 @@ var format = function (value, digits) {
  * @param {Number} value
  * @param {Number} [digits]
  * @return {Number} roundedValue
- * @private
  */
-var round = function (value, digits) {
+util.round = function (value, digits) {
     digits = (digits != undefined) ? Math.pow(10, digits) : PRECISION;
 
     return Math.round(value * digits) / digits;
@@ -51,9 +51,8 @@ var round = function (value, digits) {
  * Create a semi UUID
  * source: http://stackoverflow.com/a/105074/1262753
  * @return {String} uuid
- * @private
  */
-var createUUID = function () {
+util.createUUID = function () {
     var S4 = function () {
         return Math.floor(
             Math.random() * 0x10000 /* 65536 */