125 lines
2.7 KiB
JavaScript
125 lines
2.7 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2020 The Stdlib Authors.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Applies a quaternary callback to strided input array elements and assigns results to elements in a strided output array.
|
||
|
|
*
|
||
|
|
* @param {ArrayLikeObject<Collection>} arrays - array-like object containing four input arrays and one output array
|
||
|
|
* @param {NonNegativeIntegerArray} shape - array-like object containing a single element, the number of indexed elements
|
||
|
|
* @param {IntegerArray} strides - array-like object containing the stride lengths for the input and output arrays
|
||
|
|
* @param {Callback} fcn - quaternary callback
|
||
|
|
* @returns {void}
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var Float64Array = require( '@stdlib/array/float64' );
|
||
|
|
*
|
||
|
|
* function add( x, y, z, w ) {
|
||
|
|
* return x + y + z + w;
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var y = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var z = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var w = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var u = new Float64Array( x.length );
|
||
|
|
*
|
||
|
|
* var shape = [ x.length ];
|
||
|
|
* var strides = [ 1, 1, 1, 1, 1 ];
|
||
|
|
*
|
||
|
|
* quaternary( [ x, y, z, w, u ], shape, strides, add );
|
||
|
|
*
|
||
|
|
* console.log( u );
|
||
|
|
* // => <Float64Array>[ 4.0, 8.0, 12.0, 16.0, 20.0 ]
|
||
|
|
*/
|
||
|
|
function quaternary( arrays, shape, strides, fcn ) {
|
||
|
|
var sx;
|
||
|
|
var sy;
|
||
|
|
var sz;
|
||
|
|
var sw;
|
||
|
|
var su;
|
||
|
|
var ix;
|
||
|
|
var iy;
|
||
|
|
var iz;
|
||
|
|
var iw;
|
||
|
|
var iu;
|
||
|
|
var x;
|
||
|
|
var y;
|
||
|
|
var z;
|
||
|
|
var w;
|
||
|
|
var u;
|
||
|
|
var N;
|
||
|
|
var i;
|
||
|
|
|
||
|
|
N = shape[ 0 ];
|
||
|
|
if ( N <= 0 ) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
sx = strides[ 0 ];
|
||
|
|
sy = strides[ 1 ];
|
||
|
|
sz = strides[ 2 ];
|
||
|
|
sw = strides[ 3 ];
|
||
|
|
su = strides[ 4 ];
|
||
|
|
if ( sx < 0 ) {
|
||
|
|
ix = (1-N) * sx;
|
||
|
|
} else {
|
||
|
|
ix = 0;
|
||
|
|
}
|
||
|
|
if ( sy < 0 ) {
|
||
|
|
iy = (1-N) * sy;
|
||
|
|
} else {
|
||
|
|
iy = 0;
|
||
|
|
}
|
||
|
|
if ( sz < 0 ) {
|
||
|
|
iz = (1-N) * sz;
|
||
|
|
} else {
|
||
|
|
iz = 0;
|
||
|
|
}
|
||
|
|
if ( sw < 0 ) {
|
||
|
|
iw = (1-N) * sw;
|
||
|
|
} else {
|
||
|
|
iw = 0;
|
||
|
|
}
|
||
|
|
if ( su < 0 ) {
|
||
|
|
iu = (1-N) * su;
|
||
|
|
} else {
|
||
|
|
iu = 0;
|
||
|
|
}
|
||
|
|
x = arrays[ 0 ];
|
||
|
|
y = arrays[ 1 ];
|
||
|
|
z = arrays[ 2 ];
|
||
|
|
w = arrays[ 3 ];
|
||
|
|
u = arrays[ 4 ];
|
||
|
|
for ( i = 0; i < N; i++ ) {
|
||
|
|
u[ iu ] = fcn( x[ ix ], y[ iy ], z[ iz ], w[ iw ] );
|
||
|
|
ix += sx;
|
||
|
|
iy += sy;
|
||
|
|
iz += sz;
|
||
|
|
iw += sw;
|
||
|
|
iu += su;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = quaternary;
|