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Create an array filled with ones and having the same length and data type as a provided array.


npm install @stdlib/array-ones-like


var onesLike = require( '@stdlib/array-ones-like' );

onesLike( x[, dtype] )

Creates an array filled with ones and having the same length and data type as a provided array x.

var x = [ 1, 2, 3, 4, 5 ];

var arr = onesLike( x );
// returns [ 1, 1, 1, 1, 1 ]

The function supports the following data types:

  • float64: double-precision floating-point numbers (IEEE 754)
  • float32: single-precision floating-point numbers (IEEE 754)
  • complex128: double-precision complex floating-point numbers
  • complex64: single-precision complex floating-point numbers
  • int32: 32-bit two's complement signed integers
  • uint32: 32-bit unsigned integers
  • int16: 16-bit two's complement signed integers
  • uint16: 16-bit unsigned integers
  • int8: 8-bit two's complement signed integers
  • uint8: 8-bit unsigned integers
  • uint8c: 8-bit unsigned integers clamped to 0-255
  • generic: generic JavaScript values

By default, the output array data type is inferred from the provided array x. To return an array having a different data type, provide a dtype argument.

var x = [ 0, 0 ];

var arr = onesLike( x, 'int32' );
// returns <Int32Array>[ 1, 1 ]


  • If the output array has a complex number data type, each element of the returned array has a real component equal to 1 and an imaginary component equal to 0.


var dtypes = require( '@stdlib/array-dtypes' );
var zeros = require( '@stdlib/array-zeros' );
var onesLike = require( '@stdlib/array-ones-like' );

// Create a zero-filled array:
var x = zeros( 4, 'complex128' );

// Get a list of array data types:
var dt = dtypes();

// Generate filled arrays...
var y;
var i;
for ( i = 0; i < dt.length; i++ ) {
    y = onesLike( x, dt[ i ] );
    console.log( y );

See Also


This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.






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