time-to-botec

README.md (5162B)

---

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 # shape2strides
 
 > Generate a stride array from an array shape.
 
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 ## Usage
 
 ```javascript
 var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
 ```
 
 #### shape2strides( shape, order )
 
 Generates a stride array from an array shape.
 
 ```javascript
 var strides = shape2strides( [ 3, 2 ], 'row-major' );
 // returns [ 2, 1 ]
 ```
 
 The `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 ]
 ```
 
 #### shape2strides.assign( shape, order, out )
 
 Generates a stride array from an array shape and assigns results to a provided output array.
 
 ```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 true
 ```
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 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( ', ' ) );
 }
 ```
 
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 * * *
 
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 ## C APIs
 
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 ### Usage
 
 ```c
 #include "stdlib/ndarray/base/shape2strides.h"
 ```
 
 #### stdlib_ndarray_shape2strides( ndims, \*shape, order, \*out )
 
 Generates a stride array from an array shape.
 
 ```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 );
 ```
 
 The function accepts the following arguments:
 
 -   **ndims**: `[in] int64_t` number of dimensions.
 -   **shape**: `[in] int64_t*` array shape (dimensions).
 -   **order**: `[in] enum STDLIB_NDARRAY_ORDER` specifies whether an array is row-major (C-style) or column-major (Fortran-style).
 -   **out**: `[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 );
 ```
 
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 ### Examples
 
 ```c
 #include "stdlib/ndarray/base/shape2strides.h"
 #include "stdlib/ndarray/orders.h"
 #include <stdio.h>
 #include <inttypes.h>
 
 int main() {
     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" );
 }
 ```
 
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