main.c (1514B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #include "stdlib/ndarray/base/assert/is_column_major.h" 20 #include <stdint.h> 21 #include <stdlib.h> 22 23 /** 24 * Determines if an array is column-major based on a provided stride array. 25 * 26 * ## Notes 27 * 28 * - The function returns `1` if column-major and `0` otherwise. 29 * 30 * @param ndims number of dimensions 31 * @param strides array strides 32 * @return value indicating if column-major 33 * 34 * @example 35 * #include "stdlib/ndarray/base/assert/is_column_major.h" 36 * 37 * int64_t ndims = 2; 38 * int64_t strides[] = { 1, 10 }; 39 * 40 * int8_t b = stdlib_ndarray_is_column_major( ndims, strides ); 41 * // returns 1 42 */ 43 int8_t stdlib_ndarray_is_column_major( int64_t ndims, int64_t *strides ) { 44 int64_t s1; 45 int64_t s2; 46 int64_t i; 47 48 if ( ndims == 0 ) { 49 return 0; 50 } 51 s1 = llabs( strides[ 0 ] ); 52 for ( i = 1; i < ndims; i++ ) { 53 s2 = llabs( strides[ i ] ); 54 if ( s2 < s1 ) { 55 return 0; 56 } 57 s1 = s2; 58 } 59 return 1; 60 }