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72 lines
3.1 KiB
JavaScript
72 lines
3.1 KiB
JavaScript
import assert from 'assert'
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import { approxEqual } from '../../../../tools/approx.js'
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import math from '../../../../src/defaultInstance.js'
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const variance = math.expression.transform.variance
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describe('variance.transform', function () {
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const inputMatrix = [ // this is a 4x3x2 matrix, full test coverage
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[[10, 200], [30, 40], [50, 60]],
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[[70, 80], [90, 100], [180, 120]],
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[[130, 140], [160, 150], [170, 110]],
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[[190, 20], [210, 220], [230, 240]]
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]
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it('should return the variance value along a dimension on a matrix with one based indicies', function () {
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assert.deepStrictEqual(variance([
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[2, 6],
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[4, 10]], 2), [8, 18])
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assert.deepStrictEqual(variance([
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[2, 6],
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[4, 10]], 1), [2, 8])
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assert.deepStrictEqual(variance(inputMatrix, 1),
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[[6000, 6000], [6225, 5825], [5825, 5825]])
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assert.deepStrictEqual(variance(inputMatrix, 2),
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[[400, 7600], [3433.3333333333335, 400], [433.33333333333337, 433.33333333333337], [400, 14800]])
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assert.deepStrictEqual(variance(inputMatrix, 3),
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[[18050, 50, 50], [50, 50, 1800], [50, 50, 1800], [14450, 50, 50]])
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})
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it('should throw an error if called with an invalid one based index', function () {
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assert.throws(function () { variance(inputMatrix, 0) }, /Index out of range/)
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assert.throws(function () { variance(inputMatrix, 4) }, /Index out of range/)
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})
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it('should throw an error if called with invalid type of arguments', function () {
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assert.throws(function () { variance(new Date(), 2) }, /Cannot calculate variance, unexpected type of argument/)
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assert.throws(function () { variance(2, 3, null) }, /Cannot calculate variance, unexpected type of argument/)
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assert.throws(function () { variance([2, 3, null]) }, /Cannot calculate variance, unexpected type of argument/)
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assert.throws(function () { variance([[2, 4, 6], [1, 3, 5]], 'biased', 0) }, /Cannot convert "biased" to a number/)
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assert.throws(function () { variance([[2, 4, 6], [1, 3, 5]], 0, new Date()) }, /Cannot calculate variance, unexpected type of argument/)
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})
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it('should throw an error if called with an empty array', function () {
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assert.throws(function () { variance([]) })
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})
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it('should LaTeX var', function () {
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const expression = math.parse('variance(1,2,3)')
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assert.strictEqual(expression.toTex(), '\\mathrm{Var}\\left(1,2,3\\right)')
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})
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it('should compute the variance of quantities with units', function () {
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const a = math.unit(10, 'cm')
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const b = math.unit(20, 'cm')
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const c = math.unit(50, 'cm^2')
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approxEqual(variance([a, b]).toNumber('cm^2'), c.toNumber('cm^2'))
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})
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it('should compute the variance of quantities with compatible units', function () {
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const a = math.unit(1, 'm')
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const b = math.unit(50, 'cm')
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const c = math.unit(1250, 'cm^2')
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approxEqual(variance([a, b]).toNumber('cm^2'), c.toNumber('cm^2'))
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})
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it('should not compute the variance of quantities with incompatible units', function () {
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const a = math.unit(1, 'm')
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const b = math.unit(50, 'kg')
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assert.throws(function () { variance([a, b]) }, /Units do not match/)
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})
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})
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