71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 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/strided/base/smap.h"
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#include <stdint.h>
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/**
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* Applies a unary function accepting and returning single-precision floating-point numbers to each element in a single-precision floating-point strided input array and assigns each result to an element in a single-precision floating-point strided output array.
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*
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* @param N number of indexed elements
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* @param X input array
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* @param strideX X stride length
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* @param Y destination array
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* @param strideY Y stride length
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* @param fcn unary function to apply
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*
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* @example
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* #include "stdlib/strided/base/smap.h"
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* #include <stdint.h>
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*
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* static float scale( const float x ) {
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* return x * 10.0;
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* }
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*
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* float X[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
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* float Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
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*
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* int64_t N = 6;
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*
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* stdlib_strided_smap( N, X, 1, Y, 1, scale );
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*/
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void stdlib_strided_smap( const int64_t N, const float *X, const int64_t strideX, float *Y, const int64_t strideY, float (*fcn)( float ) ) {
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int64_t ix;
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int64_t iy;
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int64_t i;
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if ( N <= 0 ) {
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return;
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}
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if ( strideX < 0 ) {
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ix = (1-N) * strideX;
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} else {
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ix = 0;
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}
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if ( strideY < 0 ) {
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iy = (1-N) * strideY;
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} else {
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iy = 0;
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}
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for ( i = 0; i < N; i++ ) {
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Y[ iy ] = fcn( X[ ix ] );
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ix += strideX;
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iy += strideY;
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}
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return;
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}
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