@stdlib/ndarray-base-assert-is-row-major-contiguous
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    0.0.4 • Public • Published

    isRowMajorContiguous

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    Determine if an array is row-major contiguous.

    An array is contiguous if the memory address of each array element is adjacent to the memory address of the next array element.

    Installation

    npm install @stdlib/ndarray-base-assert-is-row-major-contiguous

    Usage

    var isRowMajorContiguous = require( '@stdlib/ndarray-base-assert-is-row-major-contiguous' );

    isRowMajorContiguous( shape, strides, offset )

    Returns a boolean indicating if an array is row-major contiguous.

    var shape = [ 2, 2 ];
    var strides = [ 2, 1 ];
    var offset = 25;
    
    var bool = isRowMajorContiguous( shape, strides, offset );
    // returns true
    
    shape = [ 10 ];
    strides = [ 3 ]; // every third memory element
    offset = 0;
    
    bool = isRowMajorContiguous( 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 isRowMajorContiguous = require( '@stdlib/ndarray-base-assert-is-row-major-contiguous' );
    
    var strides;
    var offset;
    var shape;
    var bool;
    var i;
    var j;
    
    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;
    
        strides[ 0 ] *= discreteUniform( 1, 2 ); // if scaled by 1, then single segment
    
        // Compute the index offset:
        offset = strides2offset( shape, strides ) + 25; // include a view offset
    
        // Determine if the array is row-major contiguous:
        bool = isRowMajorContiguous( shape, strides, offset );
        console.log( 'Shape: %s. Strides: %s. Offset: %d. Contiguous: %s.', shape.join( 'x' ), strides.join( ',' ), offset, bool );
    }

    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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    Copyright

    Copyright © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/ndarray-base-assert-is-row-major-contiguous

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    15

    Version

    0.0.4

    License

    Apache-2.0

    Unpacked Size

    45.9 kB

    Total Files

    13

    Last publish

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