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48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
// test cos
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var assert = require('assert'),
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math = require('../../../math.js'),
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approx = require('../../../tools/approx.js'),
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pi = math.pi,
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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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cos = math.cos;
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// TODO: replace all string comparisons with approx.equal comparisons with numbers
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// number
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approx.equal(cos(0), 1);
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approx.equal(cos(pi*1/4), 0.707106781186548);
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approx.equal(cos(pi*1/8), 0.923879532511287);
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approx.equal(cos(pi*2/4), 0);
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approx.equal(cos(pi*3/4), -0.707106781186548);
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approx.equal(cos(pi*4/4), -1);
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approx.equal(cos(pi*5/4), -0.707106781186548);
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approx.equal(cos(pi*6/4), 0);
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approx.equal(cos(pi*7/4), 0.707106781186548);
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approx.equal(cos(pi*8/4), 1);
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approx.equal(cos(pi/4), math.sqrt(2)/2);
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// complex
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assert.deepEqual(cos(complex('2+3i')).toString(), '-4.1896 - 9.1092i');
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assert.deepEqual(cos(complex('2-3i')).toString(), '-4.1896 + 9.1092i');
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assert.deepEqual(cos(complex('-2+3i')).toString(), '-4.1896 + 9.1092i');
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assert.deepEqual(cos(complex('-2-3i')).toString(), '-4.1896 - 9.1092i');
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assert.deepEqual(cos(complex('i')).toString(), '1.5431');
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assert.deepEqual(cos(complex('1')).toString(), '0.5403');
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assert.deepEqual(cos(complex('1+i')).toString(), '0.83373 - 0.9889i');
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// unit
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approx.equal(cos(unit('45deg')), 0.707106781186548);
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approx.equal(cos(unit('-135deg')), -0.707106781186548);
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assert.throws(function () {cos(unit('5 celsius'))});
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// string
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assert.throws(function () {cos('string')});
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// array, matrix, range
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var cos123 = [0.540302305868140, -0.41614683654714, -0.989992496600445];
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approx.deepEqual(cos([1,2,3]), cos123);
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approx.deepEqual(cos(math.range('1:3')), cos123);
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approx.deepEqual(cos(matrix([1,2,3])), matrix(cos123));
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