README.md

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stride2offset

Determine the index offset which specifies the location of the first indexed value in a strided array.

Usage

import stride2offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/strided-base-stride2offset@deno/mod.js';

stride2offset( N, stride )

Returns the index offset which specifies the location of the first indexed value in a strided array.

var offset = stride2offset( 10, 10 );
// returns 0

offset = stride2offset( 10, -10 );
// returns 90

Examples

import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@deno/mod.js';
import stride2offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/strided-base-stride2offset@deno/mod.js';

var opts = {
    'dtype': 'generic'
};

// Define the number of indexed elements:
var N = 100;

// Define a maximum stride length:
var maxStride = 10;

// Create an array of random integers which can accommodate the maximum stride length:
var arr = discreteUniform( N*maxStride, 0, 255, opts );

// Generate random stride lengths:
var strides = discreteUniform( 10, -maxStride, maxStride, opts );

// Resolve values in the data array for the first indexed element based on various stride lengths...
var offset;
var i;
for ( i = 0; i < strides.length; i++ ) {
    offset = stride2offset( N, strides[ i ] );
    console.log( 'stride = %d. arr[%d] = %d.', strides[ i ], offset, arr[ offset ] );
}

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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.