time-to-botec/js/node_modules/@stdlib/blas/base/ddot/lib/ddot.js
NunoSempere b6addc7f05 feat: add the node modules
Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00

98 lines
2.2 KiB
JavaScript

/**
* @license Apache-2.0
*
* Copyright (c) 2019 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';
// VARIABLES //
var M = 5;
// MAIN //
/**
* Computes the dot product of `x` and `y`.
*
* @param {PositiveInteger} N - number of values over which to compute the dot product
* @param {Float64Array} x - first input array
* @param {integer} strideX - `x` stride length
* @param {Float64Array} y - second input array
* @param {integer} strideY - `y` stride length
* @returns {number} dot product of `x` and `y`
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 4.0, 2.0, -3.0, 5.0, -1.0 ] );
* var y = new Float64Array( [ 2.0, 6.0, -1.0, -4.0, 8.0 ] );
*
* var z = ddot( x.length, x, 1, y, 1 );
* // returns -5.0
*/
function ddot( N, x, strideX, y, strideY ) {
var dot;
var ix;
var iy;
var m;
var i;
dot = 0.0;
if ( N <= 0 ) {
return dot;
}
// Use unrolled loops if both strides are equal to `1`...
if ( strideX === 1 && strideY === 1 ) {
m = N % M;
// If we have a remainder, run a clean-up loop...
if ( m > 0 ) {
for ( i = 0; i < m; i++ ) {
dot += x[ i ] * y[ i ];
}
}
if ( N < M ) {
return dot;
}
for ( i = m; i < N; i += M ) {
dot += ( x[ i ] * y[ i ] ) + ( x[ i+1 ] * y[ i+1 ] ) + ( x[ i+2 ] * y[ i+2 ] ) + ( x[ i+3 ] * y[ i+3 ] ) + ( x[ i+4 ] * y[ i+4 ] ); // eslint-disable-line max-len
}
return dot;
}
if ( strideX < 0 ) {
ix = ( 1-N ) * strideX;
} else {
ix = 0;
}
if ( strideY < 0 ) {
iy = ( 1-N ) * strideY;
} else {
iy = 0;
}
for ( i = 0; i < N; i++ ) {
dot += ( x[ ix ] * y[ iy ] );
ix += strideX;
iy += strideY;
}
return dot;
}
// EXPORTS //
module.exports = ddot;