main.c (1268B)
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 <stdint.h> 20 #include "stdlib/ndarray/base/numel.h" 21 22 /** 23 * Returns the number of elements in an array. 24 * 25 * @param ndims number of dimensions 26 * @param shape array shape (dimensions) 27 * @return number of elements 28 * 29 * @example 30 * #include "stdlib/ndarray/base/numel.h" 31 * 32 * int64_t ndims = 2; 33 * int64_t shape[] = { 10, 8 }; 34 * 35 * int64_t n = stdlib_ndarray_numel( ndims, shape ); 36 * // returns 80 37 */ 38 int64_t stdlib_ndarray_numel( int64_t ndims, int64_t *shape ) { 39 int64_t n; 40 int64_t i; 41 42 if ( ndims == 0 ) { 43 return 0; 44 } 45 n = 1; 46 for ( i = 0; i < ndims; i++ ) { 47 if ( shape[ i ] < 0 ) { 48 return 0; 49 } 50 n *= shape[ i ]; 51 } 52 return n; 53 }