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‎blas/ext/base/gapxsumkbn/accessors.js.html‎

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<h1><a href="../../../../../index.html">All files</a> / <a href="index.html">blas/ext/base/gapxsumkbn/lib</a> accessors.js</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 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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&nbsp;
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'use strict';
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&nbsp;
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// MODULES //
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&nbsp;
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var abs = require( '@stdlib/math/base/special/abs' );
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&nbsp;
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&nbsp;
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// MAIN //
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&nbsp;
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/**
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* Adds a scalar constant to each strided array element and computes the sum using an improved Kahan–Babuška algorithm.
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*
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* @private
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* @param {PositiveInteger} N - number of indexed elements
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* @param {number} alpha - scalar constant
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* @param {Object} x - input array object
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* @param {Collection} x.data - input array data
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* @param {Array&lt;Function&gt;} x.accessors - array element accessors
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* @param {integer} strideX - stride length
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* @param {NonNegativeInteger} offsetX - starting index
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* @returns {number} sum
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*
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* @example
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* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
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* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
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*
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* var x = toAccessorArray( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
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*
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* var v = gapxsumkbn( 4, 5.0, arraylike2object( x ), 2, 1 );
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* // returns 25.0
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*/
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function gapxsumkbn( N, alpha, x, strideX, offsetX ) {
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var xbuf;
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var get;
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var sum;
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var ix;
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var v;
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var t;
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var c;
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var i;
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&nbsp;
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// Cache reference to array data:
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xbuf = x.data;
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&nbsp;
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// Cache a reference to the element accessor:
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get = x.accessors[ 0 ];
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&nbsp;
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ix = offsetX;
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if ( strideX === 0 ) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
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<span class="cstat-no" title="statement not covered" > return N * ( alpha + get( xbuf, ix ) );</span>
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<span class="cstat-no" title="statement not covered" > }</span>
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sum = 0.0;
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c = 0.0;
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for ( i = 0; i &lt; N; i++ ) {
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v = alpha + get( xbuf, ix );
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t = sum + v;
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if ( abs( sum ) &gt;= abs( v ) ) {
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c += (sum-t) + v;
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} else {
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c += (v-t) + sum;
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}
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sum = t;
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ix += strideX;
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}
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return sum + c;
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}
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&nbsp;
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&nbsp;
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// EXPORTS //
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&nbsp;
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module.exports = gapxsumkbn;
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&nbsp;</pre></td></tr></table></pre>
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<div class='push'></div><!-- for sticky footer -->
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</div><!-- /wrapper -->
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<div class='footer quiet pad2 space-top1 center small'>
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Code coverage generated by
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<a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
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at 2025-02-10T07:03:18.694Z
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</div>
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<script src="../../../../../prettify.js"></script>
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<script>
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window.onload = function () {
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‎blas/ext/base/gapxsumkbn/coverage.ndjson‎

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[202,202,100,13,13,100,2,2,100,202,202,100,"d0c49411dbdee17017f411ca1c2d1acd0e4ccca9","2025-01-01 20:09:19 -0800"]
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[296,298,99.3289,20,21,95.2381,3,3,100,296,298,99.3289,"9d447dc24e6c56353c1dceae3bbfd88d11ce2066","2025-02-09 23:02:07 -0800"]

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