83 lines
2.3 KiB
C
83 lines
2.3 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/dmskmap.h"
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#include <stdint.h>
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/**
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* Applies a unary function accepting and returning double-precision floating-point numbers to each element in a double-precision floating-point strided input array according to a corresponding element in a strided mask array and assigns each result to an element in a double-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 Mask mask array
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* @param strideMask Mask 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/dmskmap.h"
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* #include <stdint.h>
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*
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* static double scale( const double x ) {
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* return x * 10.0;
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* }
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*
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* double X[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
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* uint8_t M[] = { 0, 0, 1, 0, 0, 1 };
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* double 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_dmskmap( N, X, 1, M, 1, Y, 1, scale );
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*/
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void stdlib_strided_dmskmap( const int64_t N, const double *X, const int64_t strideX, const uint8_t *Mask, const int64_t strideMask, double *Y, const int64_t strideY, double (*fcn)( double ) ) {
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int64_t ix;
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int64_t im;
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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 ( strideMask < 0 ) {
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im = (1-N) * strideMask;
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} else {
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im = 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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if ( Mask[ im ] == 0 ) {
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Y[ iy ] = fcn( X[ ix ] );
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}
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ix += strideX;
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im += strideMask;
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iy += strideY;
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}
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return;
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}
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