94 lines
2.4 KiB
JavaScript
94 lines
2.4 KiB
JavaScript
/**
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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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'use strict';
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// MAIN //
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/**
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* Applies a unary callback to elements in a strided input array according to elements in a strided mask array and assigns results to elements in a strided output array.
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*
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* @param {ArrayLikeObject<Collection>} arrays - array-like object containing one input array, a mask array, and one output array
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* @param {NonNegativeIntegerArray} shape - array-like object containing a single element, the number of indexed elements
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* @param {IntegerArray} strides - array-like object containing the stride lengths for the strided arrays
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* @param {NonNegativeIntegerArray} offsets - array-like object containing the starting indices (i.e., index offsets) for the strided arrays
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* @param {Callback} fcn - unary callback
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* @returns {void}
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*
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* @example
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* var Float64Array = require( '@stdlib/array/float64' );
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* var Uint8Array = require( '@stdlib/array/uint8' );
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*
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* function scale( x ) {
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* return x * 10.0;
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* }
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*
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* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
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* var m = new Uint8Array( [ 0, 0, 1, 0, 0 ] );
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* var y = new Float64Array( x.length );
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*
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* var shape = [ x.length ];
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* var strides = [ 1, 1, 1 ];
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* var offsets = [ 0, 0, 0 ];
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*
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* mskunary( [ x, m, y ], shape, strides, offsets, scale );
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*
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* console.log( y );
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* // => <Float64Array>[ 10.0, 20.0, 0.0, 40.0, 50.0 ]
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*/
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function mskunary( arrays, shape, strides, offsets, fcn ) {
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var sx;
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var sm;
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var sy;
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var ix;
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var im;
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var iy;
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var x;
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var m;
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var y;
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var N;
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var i;
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N = shape[ 0 ];
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if ( N <= 0 ) {
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return;
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}
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ix = offsets[ 0 ];
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im = offsets[ 1 ];
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iy = offsets[ 2 ];
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sx = strides[ 0 ];
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sm = strides[ 1 ];
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sy = strides[ 2 ];
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x = arrays[ 0 ];
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m = arrays[ 1 ];
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y = arrays[ 2 ];
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for ( i = 0; i < N; i++ ) {
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if ( m[ im ] === 0 ) {
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y[ iy ] = fcn( x[ ix ] );
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}
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ix += sx;
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im += sm;
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iy += sy;
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}
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}
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// EXPORTS //
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module.exports = mskunary;
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