Package Exports
- @stdlib/strided-base-stride2offset
- @stdlib/strided-base-stride2offset/dist
- @stdlib/strided-base-stride2offset/dist/index.js
- @stdlib/strided-base-stride2offset/lib/index.js
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@stdlib/strided-base-stride2offset) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
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stride2offset
Determine the index offset which specifies the location of the first indexed value in a strided array.
Installation
npm install @stdlib/strided-base-stride2offsetUsage
var stride2offset = require( '@stdlib/strided-base-stride2offset' );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 90Examples
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var stride2offset = require( '@stdlib/strided-base-stride2offset' );
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 ] );
}C APIs
Usage
#include "stdlib/strided/base/stride2offset.h"stdlib_strided_stride2offset( N, stride )
Returns the index offset which specifies the location of the first indexed value in a strided array.
#include "stdlib/strided/base/stride2offset.h"
#include <stdint.h>
int64_t offset = stdlib_strided_stride2offset( 10, -10 );
// returns 90The function accepts the following arguments:
- N:
[in] int64_tnumber of indexed elements. - stride
[in] int64_tindex increment.
int64_t stdlib_strided_stride2offset( int64_t N, int64_t stride );Examples
#include "stdlib/strided/base/stride2offset.h"
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
int main( void ) {
// Specify the number of indexed elements:
int64_t N = 6;
// Define a stride:
int64_t stride = -2;
// Compute the offset:
int64_t offset = stdlib_strided_stride2offset( N, stride )
// Print the results:
printf( "stride: %"PRId64" => offset: %"PRId64"\n", stride, offset );
}Notice
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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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License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.