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74 lines
3.0 KiB
JavaScript
74 lines
3.0 KiB
JavaScript
// test exp
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var assert = require('assert'),
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approx = require('../../../tools/approx'),
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math = require('../../../index')(),
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complex = math.complex,
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matrix = math.matrix,
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unit = math.unit,
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range = math.range,
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log10 = math.log10;
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describe('log10', function() {
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it('should return the log base 10 of a boolean', function () {
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assert.equal(log10(true), 0);
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assert.equal(log10(false), -Infinity);
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});
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it('should return the log base 10 of a number', function() {
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approx.deepEqual(log10(-3), complex('0.477121254719662 + 1.364376353841841i'));
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approx.deepEqual(log10(-2), complex('0.301029995663981 + 1.364376353841841i'));
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approx.deepEqual(log10(-1), complex('0.000000000000000 + 1.364376353841841i'));
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approx.deepEqual(log10(0), -Infinity);
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approx.deepEqual(log10(1), 0);
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approx.deepEqual(log10(2), 0.301029995663981);
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approx.deepEqual(log10(3), 0.477121254719662);
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approx.deepEqual(log10(0.01), -2);
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approx.deepEqual(log10(0.1), -1);
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approx.deepEqual(log10(1), 0);
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approx.deepEqual(log10(10), 1);
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approx.deepEqual(log10(100), 2);
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approx.deepEqual(log10(1000), 3);
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});
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it('should return the log of a bignumber', function() {
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approx.deepEqual(log10(math.bignumber(2)), 0.301029995663981);
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approx.deepEqual(log10(math.bignumber(3)), 0.477121254719662);
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});
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it('should throw an error if used with a wrong number of arguments', function() {
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assert.throws(function () {log10()}, math.error.ArgumentsError);
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assert.throws(function () {log10(1, 2)}, math.error.ArgumentsError);
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});
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it('should return the log base 10 of a complex number', function() {
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approx.deepEqual(log10(complex(0, 1)), complex('0.000000000000000 + 0.682188176920921i'));
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approx.deepEqual(log10(complex(0, -1)), complex('0.000000000000000 - 0.682188176920921i'));
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approx.deepEqual(log10(complex(1, 1)), complex('0.150514997831991 + 0.341094088460460i'));
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approx.deepEqual(log10(complex(1, -1)), complex('0.150514997831991 - 0.341094088460460i'));
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approx.deepEqual(log10(complex(-1, -1)), complex('0.150514997831991 - 1.023282265381381i'));
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approx.deepEqual(log10(complex(-1, 1)), complex('0.150514997831991 + 1.023282265381381i'));
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approx.deepEqual(log10(complex(1, 0)), complex(0, 0));
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});
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it('should throw an error when used on a unit', function() {
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assert.throws(function () {log10(unit('5cm'))});
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});
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it('should throw an error when used on a string', function() {
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assert.throws(function () {log10('text')});
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});
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it('should return the log base 10 of each element of a matrix', function() {
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var res = [0, 0.301029995663981, 0.477121254719662, 0.602059991327962];
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approx.deepEqual(log10([1,2,3,4]), res);
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approx.deepEqual(log10(matrix([1,2,3,4])), matrix(res));
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approx.deepEqual(math.divide(log10(matrix([1,2,3,4])), math.LOG10E),
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matrix([0, 0.693147180559945, 1.098612288668110, 1.386294361119891]));
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approx.deepEqual(log10(matrix([[1,2],[3,4]])),
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matrix([[0, 0.301029995663981], [0.477121254719662, 0.602059991327962]]));
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});
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});
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