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* @license Apache-2.0
*
* Copyright (c) 2022 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';
// MODULES //
var vind2bind = require( '@stdlib/ndarray/base/vind2bind' );
// VARIABLES //
var MODE = 'throw';
// MAIN //
/**
* Applies a function to elements in two input arrays and assigns the results to an output array.
*
* @private
* @param {Object} x - object containing meta data for the first input ndarray
* @param {string} x.ref - reference to original input ndarray-like object
* @param {string} x.dtype - data type
* @param {Collection} x.data - data buffer
* @param {NonNegativeInteger} x.length - number of elements
* @param {NonNegativeIntegerArray} x.shape - dimensions
* @param {IntegerArray} x.strides - stride lengths
* @param {NonNegativeInteger} x.offset - index offset
* @param {string} x.order - specifies whether `x` is row-major (C-style) or column-major (Fortran-style)
* @param {Array<Function>} x.accessors - accessors for accessing data buffer elements
* @param {Object} y - object containing meta data for the second input ndarray
* @param {string} y.ref - reference to original input ndarray-like object
* @param {string} y.dtype - data type
* @param {Collection} y.data - data buffer
* @param {NonNegativeInteger} y.length - number of elements
* @param {NonNegativeIntegerArray} y.shape - dimensions
* @param {IntegerArray} y.strides - stride lengths
* @param {NonNegativeInteger} y.offset - index offset
* @param {string} y.order - specifies whether `y` is row-major (C-style) or column-major (Fortran-style)
* @param {Array<Function>} y.accessors - accessors for accessing data buffer elements
* @param {Object} z - object containing output ndarray meta data
* @param {string} z.dtype - data type
* @param {Collection} z.data - data buffer
* @param {NonNegativeInteger} z.length - number of elements
* @param {NonNegativeIntegerArray} z.shape - dimensions
* @param {IntegerArray} z.strides - stride lengths
* @param {NonNegativeInteger} z.offset - index offset
* @param {string} z.order - specifies whether `z` is row-major (C-style) or column-major (Fortran-style)
* @param {Array<Function>} z.accessors - accessors for accessing data buffer elements
* @param {Function} fcn - function to apply
* @param {*} thisArg - function execution context
* @returns {void}
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
* var realf = require( '@stdlib/complex/float32/real' );
* var imagf = require( '@stdlib/complex/float32/imag' );
* var naryFunction = require( '@stdlib/utils/nary-function' );
* var add = require( '@stdlib/complex/float32/base/add' );
*
* // Create data buffers:
* var xbuf = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );
* var ybuf = new Complex64Array( [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ] );
* var zbuf = new Complex64Array( 4 );
*
* // Define the shape of the input and output arrays:
* var shape = [ 2, 2 ];
*
* // Define the array strides:
* var sx = [ 2, 1 ];
* var sy = [ 2, 1 ];
* var sz = [ 2, 1 ];
*
* // Define the index offsets:
* var ox = 0;
* var oy = 0;
* var oz = 0;
*
* // Define getters and setters:
* function getter( buf, idx ) {
* return buf.get( idx );
* }
*
* function setter( buf, idx, value ) {
* buf.set( value, idx );
* }
*
* // Create the input and output ndarray-like objects:
* var x = {
* 'ref': null,
* 'dtype': 'complex64',
* 'data': xbuf,
* 'length': 4,
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
* x.ref = x;
*
* var y = {
* 'ref': null,
* 'dtype': 'complex64',
* 'data': ybuf,
* 'length': 4,
* 'shape': shape,
* 'strides': sy,
* 'offset': ox,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
* y.ref = y;
*
* var z = {
* 'ref': null,
* 'dtype': 'complex64',
* 'data': zbuf,
* 'length': 4,
* 'shape': shape,
* 'strides': sz,
* 'offset': oz,
* 'order': 'row-major',
* 'accessors': [ getter, setter ]
* };
*
* // Apply the function:
* map2( x, y, z, naryFunction( add, 2 ) );
*
* var v = z.data.get( 0 );
*
* var re = realf( v );
* // returns 2.0
*
* var im = imagf( v );
* // returns 3.0
*/
function map2( x, y, z, fcn, thisArg ) {
var xbuf;
var ybuf;
var zbuf;
var ordx;
var ordy;
var ordz;
var xget;
var yget;
var zset;
var xref;
var yref;
var shx;
var shy;
var shz;
var len;
var sx;
var sy;
var sz;
var ox;
var oy;
var oz;
var ix;
var iy;
var iz;
var i;
// Cache the total number of elements over which to iterate:
len = x.length;
// Cache the array shapes:
shx = x.shape;
shy = y.shape;
shz = z.shape;
// Cache references to the input and output ndarray data buffers:
xbuf = x.data;
ybuf = y.data;
zbuf = z.data;
// Cache references to the respective stride arrays:
sx = x.strides;
sy = y.strides;
sz = z.strides;
// Cache the indices of the first indexed elements in the respective ndarrays:
ox = x.offset;
oy = y.offset;
oz = z.offset;
// Cache the respective array orders:
ordx = x.order;
ordy = y.order;
ordz = z.order;
// Cache accessors:
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
zset = z.accessors[ 1 ];
// Cache references to the original input arrays:
xref = x.ref;
yref = y.ref;
// Check for a zero-dimensional array...
if ( shx.length === 0 && shy.length === 0 ) {
zset( zbuf, oz, fcn.call( thisArg, xget( xbuf, ox ), yget( ybuf, oy ), 0, [ xref, yref ] ) ); // eslint-disable-line max-len
return;
}
// Iterate over the arrays based on the linear **view** index, regardless as to how the data is stored in memory (note: this has negative performance implications for non-contiguous ndarrays due to a lack of data locality)...
for ( i = 0; i < len; i++ ) {
ix = vind2bind( shx, sx, ox, ordx, i, MODE );
iy = vind2bind( shy, sy, oy, ordy, i, MODE );
iz = vind2bind( shz, sz, oz, ordz, i, MODE );
zset( zbuf, iz, fcn.call( thisArg, xget( xbuf, ix ), yget( ybuf, iy ), i, [ xref, yref ] ) ); // eslint-disable-line max-len
}
}
// EXPORTS //
module.exports = map2;
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