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isBufferLengthCompatible

Determine if a buffer length is compatible with ndarray meta data.

Installation

npm install @stdlib/ndarray-base-assert-is-buffer-length-compatible

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var isBufferLengthCompatible = require( '@stdlib/ndarray-base-assert-is-buffer-length-compatible' );

isBufferLengthCompatible( len, shape, strides, offset )

Returns a boolean indicating if a buffer length is compatible with provided ndarray meta data.

var shape = [ 2, 2 ];
var strides = [ 2, 1 ];
var offset = 25;

var bool = isBufferLengthCompatible( 30, shape, strides, offset );
// returns true

bool = isBufferLengthCompatible( 4, shape, strides, offset );
// returns false

Examples

var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );
var strides2offset = require( '@stdlib/ndarray-base-strides2offset' );
var randu = require( '@stdlib/random-base-randu' );
var isBufferLengthCompatible = require( '@stdlib/ndarray-base-assert-is-buffer-length-compatible' );

var strides;
var offset;
var shape;
var bool;
var len;
var i;
var j;

len = 500; // buffer length
shape = [ 0, 0, 0 ];

for ( i = 0; i < 100; i++ ) {
    // Generate a random array shape:
    shape[ 0 ] = discreteUniform( 1, 10 );
    shape[ 1 ] = discreteUniform( 1, 10 );
    shape[ 2 ] = discreteUniform( 1, 10 );

    // Generate strides:
    if ( randu() < 0.5 ) {
        strides = shape2strides( shape, 'row-major' );
    } else {
        strides = shape2strides( shape, 'column-major' );
    }
    j = discreteUniform( 0, shape.length-1 );
    strides[ j ] *= ( randu() < 0.5 ) ? -1 : 1;

    // Compute the index offset:
    offset = strides2offset( shape, strides ) + discreteUniform( 0, 200 );

    // Determine if a buffer length is compatible with generated meta data:
    bool = isBufferLengthCompatible( len, shape, strides, offset );
    console.log( 'Buffer length: %d. Shape: %s. Strides: %s. Offset: %d. Compatible: %s.', len, shape.join( 'x' ), strides.join( ',' ), offset, bool );
}

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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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.