mathjs/test/function/statistics/min.test.js

var assert = require('assert')
var math = require('../../../src/index')
var BigNumber = math.type.BigNumber
var Complex = math.type.Complex
var DenseMatrix = math.type.DenseMatrix
var Unit = math.type.Unit
var min = math.min

describe('min', function () {
  it('should return the min between several numbers', function () {
    assert.equal(min(5), 5)
    assert.equal(min(1, 3), 1)
    assert.equal(min(3, 1), 1)
    assert.equal(min(1, 3, 5, -5, 2), -5)
    assert.equal(min(0, 0, 0, 0), 0)
  })

  it('should return the min of strings by their numerical value', function () {
    assert.equal(min('10', '3', '4', '2'), '2')
  })

  it('should return the min element from a vector', function () {
    assert.equal(min([1, 3, 5, -5, 2]), -5)
  })

  it('should return the min of big numbers', function () {
    assert.deepEqual(min(new BigNumber(1), new BigNumber(3), new BigNumber(5), new BigNumber(2), new BigNumber(-5)),
      new BigNumber(-5))
  })

  it('should return the min element from a vector array', function () {
    assert.equal(min(new DenseMatrix([1, 3, 5, -5, 2])), -5)
  })

  it('should return the max element from a 2d matrix', function () {
    assert.deepEqual(min([
      [1, 4, 7],
      [3, 0, 5],
      [-1, 9, 11]
    ]), -1)
    assert.deepEqual(min(new DenseMatrix([
      [1, 4, 7],
      [3, 0, 5],
      [-1, 9, 11]
    ])), -1)
  })

  it('should return a reduced n-1 matrix from a n matrix', function () {
    assert.deepEqual(min([
      [1, 2, 3],
      [4, 5, 6],
      [7, 8, 9]], 0), [1, 2, 3])
    assert.deepEqual(min([
      [1, 2, 3],
      [4, 5, 6],
      [7, 8, 9]], 1), [1, 4, 7])

    assert.deepEqual(min([
      [1, 2, 3],
      [6, 5, 4],
      [8, 7, 9]], 1), [1, 4, 7])

    assert.deepEqual(min([
      [[1, 2], [3, 4], [5, 6]],
      [[6, 7], [8, 9], [10, 11]]], 2),
    [[1, 3, 5], [6, 8, 10]])

    assert.deepEqual(min([
      [[1, 2], [3, 4], [5, 6]],
      [[6, 7], [8, 9], [10, 11]]], 1),
    [[1, 2], [6, 7]])

    assert.deepEqual(min([
      [[1, 2], [3, 4], [5, 6]],
      [[6, 7], [8, 9], [10, 11]]], 0),
    [[1, 2], [3, 4], [5, 6]])
  })

  it('should throw an error when called multiple arrays or matrices', function () {
    assert.throws(function () { min([1, 2], [3, 4]) }, /Scalar values expected/)
    assert.throws(function () { min(math.matrix([1, 2]), math.matrix([3, 4])) }, /Scalar values expected/)
  })

  it('should throw an error if called a dimension out of range', function () {
    assert.throws(function () { min([1, 2, 3], -1) }, /IndexError: Index out of range \(-1 < 0\)/)
    assert.throws(function () { min([1, 2, 3], 1) }, /IndexError: Index out of range \(1 > 0\)/)
  })

  it('should throw an error if called with invalid number of arguments', function () {
    assert.throws(function () { min() })
    assert.throws(function () { min([], 2, 3) })
  })

  it('should throw an error if called with an empty array', function () {
    assert.throws(function () { min([]) })
  })

  it('should throw an error if called with invalid type of arguments', function () {
    assert.throws(function () { min(2, new Complex(2, 5)) }, /TypeError: Cannot calculate min, no ordering relation is defined for complex numbers/)
    assert.throws(function () { min(new Complex(2, 3), new Complex(2, 1)) }, /TypeError: Cannot calculate min, no ordering relation is defined for complex numbers/)

    assert.throws(function () { min([[2, undefined, 4]]) }, /TypeError: Cannot calculate min, unexpected type of argument/)
    assert.throws(function () { min([[2, new Date(), 4]]) }, /TypeError: Cannot calculate min, unexpected type of argument/)
    assert.throws(function () { min([2, null, 4]) }, /TypeError: Cannot calculate min, unexpected type of argument/)
    assert.throws(function () { min([[2, 5], [4, null], [1, 7]], 0) }, /TypeError: Cannot calculate min, unexpected type of argument/)
  })

  it('should LaTeX min', function () {
    var expression = math.parse('min(1,2,3)')
    assert.equal(expression.toTex(), '\\min\\left(1,2,3\\right)')
  })
})