takeIndexed2

Take elements from two indexed arrays in a single pass.

Usage

var takeIndexed2 = require( '@stdlib/array/base/take-indexed2' );

takeIndexed2( x, y, indices )

Takes elements from two indexed arrays in a single pass.

var x = [ 1, 2, 3, 4 ];
var y = [ 5, 6, 7, 8 ];

var out = takeIndexed2( x, y, [ 1, 3 ] );
// returns [ [ 2, 4 ], [ 6, 8 ] ]

If indices is an empty array, the function returns empty arrays.

var x = [ 1, 2, 3, 4 ];
var y = [ 5, 6, 7, 8 ];

var out = takeIndexed2( x, y, [] );
// returns [ [], [] ]

Notes

The function does not perform bounds checking. If an index is less than zero or greater than the maximum index of x or y, the value of the corresponding element in the respective output array is undefined.
An indexed array-like object is a data structure in which one retrieves elements via integer indices using bracket [] notation (e.g., Float64Array, Int32Array, Array, etc). This is in contrast to an accessor array-like object in which one retrieves elements using get and set methods (e.g., Complex64Array and Complex128Array).

Examples

var filledBy = require( '@stdlib/array/base/filled-by' );
var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
var linspace = require( '@stdlib/array/base/linspace' );
var takeIndexed2 = require( '@stdlib/array/base/take-indexed2' );

// Generate linearly spaced arrays:
var x = linspace( 0, 100, 11 );
console.log( x );

var y = linspace( 100, 200, 11 );
console.log( y );

// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, x.length-1 ) );
console.log( indices );

// Take a random sample of elements from `x` and `y`:
var out = takeIndexed2( x, y, indices );
console.log( out );