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Determine the index offset which specifies the location of the first indexed value in a strided array.
import stride2offset from 'https://cdn.jsdelivr.net/gh/stdlib-js/strided-base-stride2offset@deno/mod.js';
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
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 ] );
}
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.
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