Vector.md

Vector utils

constructor(arr: Array<number>)

arr: One-dimensional array.

argSort(): Array<number>

The sorted index of array.

static sign(arr: number|Array<number>): number|Array<number>

For each element, when its value equals to 0 returns 0, else if it's larger than 0 returns 1 else returns -1. If arr is a number, just return a result number.

static rand(m: number)

Create specific number of random numbers between 0 and 1.

const Vector = require('mlhelper').utils.Vector;

const arr = [4,7,1,8,2];
const vect = new Vector(arr);

expect(vect.argSort()).to.eql([2,4,0,1,3]); //true
expect(Vector.sign([-2,2,0,4])).to.eql([-1,1,0,1]); //true
expect(Vector.sign(-6)).to.eql(-1); // true