mathjs/test/function/statistics/max.test.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

var assert = require('assert'),
    math = require('../../../index'),
    bignumber = math.bignumber,
    max = math.max;

describe('max', function() {

  it('should return the max of numbers', function() {
    assert.equal(max(5), 5);
    assert.equal(max(3,1), 3);
    assert.equal(max(1,3), 3);
    assert.equal(max(1,3,5,2,-5), 5);
    assert.equal(max(0,0,0,0), 0);
  });

  it('should return the max of big numbers', function() {
    assert.deepEqual(max(bignumber(1),bignumber(3),bignumber(5),bignumber(2),bignumber(-5)),
        bignumber(5));
  });

  it('should return the max string following lexical order', function() {
    assert.equal(max('A', 'C', 'D', 'B'), 'D');
  });

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

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

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

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

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

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

  it('should throw an error when called with complex numbers', function() {
    assert.throws(function () {max(math.complex(2,3), math.complex(2,1))}, TypeError);
    assert.throws(function () {max(math.complex(2,3), math.complex(2,5))}, TypeError);

    assert.throws(function () {max(math.complex(3,4), 4)}, TypeError);
    assert.throws(function () {max(math.complex(3,4), 5)}, TypeError);
    assert.throws(function () {max(5, math.complex(3,4))}, TypeError);
    assert.throws(function () {max(math.complex(3,4), 6)}, TypeError);
  });

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

  it('should return undefined if called with an empty array', function() {
    assert.throws(function() {max([])});
  });

});