Generate a stride array from an array shape.
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Generate a stride array from an array shape.
bash
npm install @stdlib/ndarray-base-shape2stridesscript tag without installation and bundlers, use the [ES Module][es-module] available on the [esm][esm-url] branch (see [README][esm-readme]).deno][deno-url] branch (see [README][deno-readme] for usage intructions).umd][umd-url] branch (see [README][umd-readme]).javascript
var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );javascript
var strides = shape2strides( [ 3, 2 ], 'row-major' );
// returns [ 2, 1 ]order parameter specifies whether an array is row-major (C-style) or column-major (Fortran-style).javascript
var strides = shape2strides( [ 3, 2 ], 'column-major' );
// returns [ 1, 3 ]javascript
var shape = [ 3, 2 ];
var strides = [ 0, 0 ];
var out = shape2strides.assign( shape, 'row-major', strides );
// returns [ 2, 1 ]
var bool = ( strides === out );
// returns truejavascript
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );
var strides;
var shape;
var i;
shape = [ 0, 0, 0 ];
for ( i = 0; i < 100; i++ ) {
shape[ 0 ] = discreteUniform( 1, 10 );
shape[ 1 ] = discreteUniform( 1, 10 );
shape[ 2 ] = discreteUniform( 1, 10 );
strides = shape2strides( shape, 'row-major' );
console.log( 'shape: %s. strides: %s.', shape.join( 'x' ), strides.join( ', ' ) );
}c
#include "stdlib/ndarray/base/shape2strides.h"c
#include "stdlib/ndarray/orders.h"
int64_t ndims = 3;
int64_t shape[] = { 2, 3, 10 };
int64_t out[ 3 ];
stdlib_ndarray_shape2strides( ndims, shape, STDLIB_NDARRAY_ROW_MAJOR, out );[in] int64_t number of dimensions.[in] int64_t* array shape (dimensions).[in] enum STDLIB_NDARRAY_ORDER specifies whether an array is row-major (C-style) or column-major (Fortran-style).[out] int64_t* output strides array.c
int8_t stdlib_ndarray_shape2strides( int64_t ndims, int64_t *shape, enum STDLIB_NDARRAY_ORDER order, int64_t *out );c
#include "stdlib/ndarray/base/shape2strides.h"
#include "stdlib/ndarray/orders.h"
#include <stdio.h>
#include <inttypes.h>
int main( void ) {
int64_t shape[] = { 2, 3, 10 };
int64_t ndims = 3;
int64_t out[ 3 ];
stdlib_ndarray_shape2strides( ndims, shape, STDLIB_NDARRAY_ROW_MAJOR, out );
int i;
printf( "strides = { " );
for ( i = 0; i < ndims; i++ ) {
printf( "%"PRId64"", out[ i ] );
if ( i < ndims-1 ) {
printf( ", " );
}
}
printf( " }\n" );
}
