Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* @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';
// MODULES //
var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var accessors = require( './accessors.js' );
// VARIABLES //
var M = 5;
// MAIN //
/**
* Computes the dot product of `x` and `y`.
*
* @param {integer} N - number of indexed elements
* @param {NumericArray} x - first input array
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {NumericArray} y - second input array
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {number} dot product
*
* @example
* var x = [ 4.0, 2.0, -3.0, 5.0, -1.0 ];
* var y = [ 2.0, 6.0, -1.0, -4.0, 8.0 ];
* var z = gdot( x.length, x, 1, 0, y, 1, 0 );
* // returns -5.0
*/
function gdot( N, x, strideX, offsetX, y, strideY, offsetY ) {
var dot;
var ix;
var iy;
var ox;
var oy;
var m;
var i;
dot = 0.0;
if ( N <= 0 ) {
return dot;
}
ox = arraylike2object( x );
oy = arraylike2object( y );
if ( ox.accessorProtocol || oy.accessorProtocol ) {
return accessors( N, ox, strideX, offsetX, oy, strideY, offsetY );
}
ix = offsetX;
iy = offsetY;
// 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[ ix ] * y[ iy ] );
ix += 1;
iy += 1;
}
}
if ( N < M ) {
return dot;
}
for ( i = m; i < N; i += M ) {
dot += ( x[ix]*y[iy] ) + ( x[ix+1]*y[iy+1] ) + ( x[ix+2]*y[iy+2] ) + ( x[ix+3]*y[iy+3] ) + ( x[ix+4]*y[iy+4] ); // eslint-disable-line max-len
ix += M;
iy += M;
}
return dot;
}
for ( i = 0; i < N; i++ ) {
dot += x[ ix ] * y[ iy ];
ix += strideX;
iy += strideY;
}
return dot;
}
// EXPORTS //
module.exports = gdot;
|