@stdlib/array-incrspace

Generate a linearly spaced numeric array using a provided increment.

Usage no npm install needed!

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README

Incrspace

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Generate a linearly spaced numeric array using a provided increment.

Installation

npm install @stdlib/array-incrspace

Usage

var incrspace = require( '@stdlib/array-incrspace' );

incrspace( start, stop[, increment] )

Generates a linearly spaced numeric array. If an increment is not provided, the default increment is 1.

var arr = incrspace( 0, 11, 2 );
// returns [ 0, 2, 4, 6, 8, 10 ]

Notes

  • The output array is guaranteed to include the start value but does not include the stop value. Beware that values subsequent to the start value are subject to floating-point errors. Hence,

    var arr = incrspace( 0.1, 0.5, 0.2 );
// returns [ 0.1, ~0.3 ]

    where arr[1] is only guaranteed to be approximately equal to 0.3.

    If you desire more control over element precision, consider using roundn:

    var roundn = require( '@stdlib/math-base-special-roundn' );
var arr;
var out;
var i;

// Create an array subject to floating-point errors:
arr = incrspace( 0, 1.01, 0.02 );

// Round each value to the nearest hundredth:
out = [];
for ( i = 0; i < arr.length; i++ ) {
    out.push( roundn( arr[ i ], -2 ) );
}

console.log( out.join( '\n' ) );

Examples

var incrspace = require( '@stdlib/array-incrspace' );
var out;

// Default behavior:
console.log( '\nDefault:' );
out = incrspace( 0, 10 );
console.log( out.join( '\n' ) );

// Specify increment:
console.log( '\nIncrement 2:' );
out = incrspace( 0, 10, 2 );
console.log( out.join( '\n' ) );

console.log( '\nIncrement 2:' );
out = incrspace( 0, 11, 2 );
console.log( out.join( '\n' ) );

console.log( '\nIncrement 0.02:' );
out = incrspace( 0, 1.01, 0.02 );
console.log( out.join( '\n' ) );

// Create an array using a negative increment:
console.log( '\nDecremented values:' );
out = incrspace( 10, 0, -2 );
console.log( out.join( '\n' ) );

See Also

Notice

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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License

See LICENSE.

Copyright

Copyright © 2016-2022. The Stdlib Authors.