60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdlib/ndarray/base/shape2strides.h"
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#include "stdlib/ndarray/orders.h"
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#include <stdint.h>
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/**
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* Generates a stride array from an array shape.
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*
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* @param ndims number of dimensions
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* @param shape array shape (dimensions)
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* @param order specifies whether an array is row-major (C-style) or column-major (Fortran-style)
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* @param out output strides array
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* @return status code
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*
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* @example
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* #include "stdlib/ndarray/base/shape2strides.h"
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* #include "stdlib/ndarray/orders.h"
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*
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* int64_t ndims = 3;
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* int64_t shape[] = { 2, 3, 10 };
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* int64_t out[ 3 ];
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*
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* stdlib_ndarray_shape2strides( ndims, shape, STDLIB_NDARRAY_ROW_MAJOR, out );
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*/
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int8_t stdlib_ndarray_shape2strides( int64_t ndims, int64_t *shape, enum STDLIB_NDARRAY_ORDER order, int64_t *out ) {
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int64_t i;
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int64_t s;
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s = 1;
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if ( order == STDLIB_NDARRAY_COLUMN_MAJOR ) {
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for ( i = 0; i < ndims; i++ ) {
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out[ i ] = s;
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s *= shape[ i ];
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}
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} else { // row-major
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for ( i = ndims-1; i >= 0; i-- ) {
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out[ i ] = s;
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s *= shape[ i ];
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}
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}
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return 0;
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}
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