README.md

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isSingleSegmentCompatible

Determine if an array is compatible with a single memory segment.

An array is compatible with a single memory segment when an array view spans only the elements belonging to the array. When an array is compatible with a single memory segment, array data can be stored as a single block of memory.

Usage

import isSingleSegmentCompatible from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-assert-is-single-segment-compatible@deno/mod.js';

isSingleSegmentCompatible( shape, strides, offset )

Returns a boolean indicating if an array is compatible with a single memory segment.

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

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

shape = [ 10 ];
strides = [ 3 ]; // every third memory element
offset = 0;

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

Examples

import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-discrete-uniform@deno/mod.js';
import shape2strides from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-shape2strides@deno/mod.js';
import strides2offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-strides2offset@deno/mod.js';
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@deno/mod.js';
import isSingleSegmentCompatible from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-assert-is-single-segment-compatible@deno/mod.js';

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, 4 ); // if scaled by 1, then single segment

    // Compute the index offset:
    offset = strides2offset( shape, strides );

    // Determine if the array is compatible with a single memory segment:
    bool = isSingleSegmentCompatible( shape, strides, offset );
    console.log( 'Shape: %s. Strides: %s. Offset: %d. Single segment compatible: %s.', shape.join( 'x' ), strides.join( ',' ), offset, bool );
}

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Notice

This package is part of stdlib, a standard library 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.