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https://github.com/josdejong/mathjs.git
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92 lines
2.9 KiB
JavaScript
92 lines
2.9 KiB
JavaScript
'use strict';
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module.exports = function(config) {
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var typed = require('typed-function');
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var collection = require('../../type/collection');
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var divideScalar = require('./divideScalar');
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var multiply = require('./multiply');
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var inv = require('../matrix/inv')(config);
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/**
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* Divide two values, `x / y`.
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* To divide matrices, `x` is multiplied with the inverse of `y`: `x * inv(y)`.
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*
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* Syntax:
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*
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* math.divide(x, y)
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*
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* Examples:
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*
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* math.divide(2, 3); // returns Number 0.6666666666666666
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*
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* var a = math.complex(5, 14);
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* var b = math.complex(4, 1);
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* math.divide(a, b); // returns Complex 2 + 3i
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*
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* var c = [[7, -6], [13, -4]];
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* var d = [[1, 2], [4, 3]];
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* math.divide(c, d); // returns Array [[-9, 4], [-11, 6]]
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*
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* var e = math.unit('18 km');
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* math.divide(e, 4.5); // returns Unit 4 km
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*
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* See also:
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*
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* multiply
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*
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* @param {Number | BigNumber | Boolean | Complex | Unit | Array | Matrix | null} x Numerator
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* @param {Number | BigNumber | Boolean | Complex | Array | Matrix | null} y Denominator
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* @return {Number | BigNumber | Complex | Unit | Array | Matrix} Quotient, `x / y`
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*/
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return typed('divide', {
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'any, any': divideScalar,
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'Array | Matrix, Array | Matrix': function (x, y) {
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// TODO: implement matrix right division using pseudo inverse
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// http://www.mathworks.nl/help/matlab/ref/mrdivide.html
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// http://www.gnu.org/software/octave/doc/interpreter/Arithmetic-Ops.html
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// http://stackoverflow.com/questions/12263932/how-does-gnu-octave-matrix-division-work-getting-unexpected-behaviour
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return multiply(x, inv(y));
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},
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'Array | Matrix, any': function (x, y) {
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return collection.deepMap2(x, y, divideScalar);
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},
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'any, Array | Matrix': function (x, y) {
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return multiply(x, inv(y));
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}
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});
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};
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// TODO: cleanup
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//math.divide = function(x, y) {
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// if (arguments.length != 2) {
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// throw new TypeError('Too ' + (arguments.length > 2 ? 'many' : 'few') +
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// ' arguments (expected: 2, actual: ' + arguments.length + ')');
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// }
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//
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// if (isCollection(x)) {
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// if (isCollection(y)) {
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// // TODO: implement matrix right division using pseudo inverse
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// // http://www.mathworks.nl/help/matlab/ref/mrdivide.html
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// // http://www.gnu.org/software/octave/doc/interpreter/Arithmetic-Ops.html
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// // http://stackoverflow.com/questions/12263932/how-does-gnu-octave-matrix-division-work-getting-unexpected-behaviour
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// return math.multiply(x, math.inv(y));
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// }
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// else {
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// // matrix / scalar
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// return collection.deepMap2(x, y, divideScalar);
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// }
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// }
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//
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// if (isCollection(y)) {
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// // TODO: implement matrix right division using pseudo inverse
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// return math.multiply(x, math.inv(y));
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// }
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//
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// // divide two scalars
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// return divideScalar(x, y);
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//};
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