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‎blas/base/dgemv/base.js.html‎

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var dscal = require( '@stdlib/blas/base/dscal' ).ndarray;
377459
&nbsp;
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&nbsp;
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// FUNCTIONS //
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&nbsp;
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/**
464+
* Tests whether a provided string indicates to transpose a matrix.
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*
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* @private
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* @param {string} str - input string
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* @returns {boolean} boolean indicating whether to transpose a matrix
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*
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* @example
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* var bool = isTransposed( 'transpose' );
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* // returns true
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*
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* @example
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* var bool = isTransposed( 'conjugate-transpose' );
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* // returns true
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*
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* @example
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* var bool = isTransposed( 'no-transpose' );
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* // returns false
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*/
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function isTransposed( str ) { // TODO: consider moving to a separate helper utility package
483+
return ( str !== 'no-transpose' );
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}
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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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var xlen;
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var ylen;
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var tmp;
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var ix1;
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var iy1;
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var sa0;
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var sa1;
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var da0;
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var da1;
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var ix;
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var iy;
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var ia;
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var i1;
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var i0;
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var oa;
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&nbsp;
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// Note on variable naming convention: sa#, ix#, i# where # corresponds to the loop number, with `0` being the innermost loop...
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// Note on variable naming convention: da#, i# where # corresponds to the loop number, with `0` being the innermost loop...
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&nbsp;
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isrm = isRowMajor( [ strideA1, strideA2 ] );
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if ( isrm ) {
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// For row-major matrices, the last dimension has the fastest changing index...
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sa0 = strideA2; // stride for innermost loop
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sa1 = strideA1; // stride for outermost loop
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} else { // isColMajor
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// For column-major matrices, the first dimension has the fastest changing index...
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sa0 = strideA1; // stride for innermost loop
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sa1 = strideA2; // stride for outermost loop
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}
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if ( trans === 'no-transpose' ) {
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xlen = N;
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ylen = M;
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} else {
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if ( isTransposed( trans ) ) {
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xlen = M;
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ylen = N;
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} else {
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xlen = N;
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ylen = M;
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}
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// y = beta*y
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if ( beta !== 1.0 ) {
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if ( beta === 0.0 ) {
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dfill( ylen, 0.0, y, strideY, offsetY );
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} else {
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dscal( ylen, beta, y, strideY, offsetY );
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}
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if ( beta === 0.0 ) {
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dfill( ylen, 0.0, y, strideY, offsetY );
546+
} else if ( beta !== 1.0 ) {
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dscal( ylen, beta, y, strideY, offsetY );
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}
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if ( alpha === 0.0 ) {
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return y;
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}
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// Form: y = α*A*x + y
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if (
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( !isrm &amp;&amp; trans === 'no-transpose' ) ||
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( isrm &amp;&amp; trans !== 'no-transpose' )
554+
( !isrm &amp;&amp; !isTransposed( trans ) ) ||
555+
( isrm &amp;&amp; isTransposed( trans ) )
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) {
460-
ix1 = offsetX;
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if ( isrm ) {
558+
// For row-major matrices, the last dimension has the fastest changing index...
559+
da0 = strideA2; // offset increment for innermost loop
560+
da1 = strideA1 - ( ylen*strideA2 ); // offset increment for outermost loop
561+
} else { // isColMajor
562+
// For column-major matrices, the first dimension has the fastest changing index...
563+
da0 = strideA1; // offset increment for innermost loop
564+
da1 = strideA2 - ( ylen*strideA1 ); // offset increment for outermost loop
565+
}
566+
ia = offsetA;
567+
ix = offsetX;
461568
for ( i1 = 0; i1 &lt; xlen; i1++ ) {
462-
tmp = alpha * x[ ix1 ];
463-
oa = offsetA + (sa1*i1);
464-
iy1 = offsetY;
465-
for ( i0 = 0; i0 &lt; ylen; i0++ ) {
466-
y[ iy1 ] += A[ oa+(sa0*i0) ] * tmp;
467-
iy1 += strideY;
569+
tmp = alpha * x[ ix ];
570+
if ( tmp === 0.0 ) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
571+
<span class="cstat-no" title="statement not covered" > ia += da0 * ylen;</span>
572+
} else {
573+
iy = offsetY;
574+
for ( i0 = 0; i0 &lt; ylen; i0++ ) {
575+
y[ iy ] += A[ ia ] * tmp;
576+
iy += strideY;
577+
ia += da0;
578+
}
468579
}
469-
ix1 += strideX;
580+
ix += strideX;
581+
ia += da1;
470582
}
471583
return y;
472584
}
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// Form: y = α*A^T*x + y
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&nbsp;
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// ( !isrm &amp;&amp; trans !== 'no-transpose' ) || ( isrm &amp;&amp; trans === 'no-transpose' )
476-
iy1 = offsetY;
587+
// ( !isrm &amp;&amp; isTransposed( trans ) ) || ( isrm &amp;&amp; !isTransposed( trans ) )
588+
if ( isrm ) {
589+
// For row-major matrices, the last dimension has the fastest changing index...
590+
da0 = strideA2; // offset increment for innermost loop
591+
da1 = strideA1 - ( xlen*strideA2 ); // offset increment for outermost loop
592+
} else { // isColMajor
593+
// For column-major matrices, the first dimension has the fastest changing index...
594+
da0 = strideA1; // offset increment for innermost loop
595+
da1 = strideA2 - ( xlen*strideA1 ); // offset increment for outermost loop
596+
}
597+
ia = offsetA;
598+
iy = offsetY;
477599
for ( i1 = 0; i1 &lt; ylen; i1++ ) {
478600
tmp = 0.0;
479-
ix1 = offsetX;
480-
oa = offsetA + (sa1*i1);
601+
ix = offsetX;
481602
for ( i0 = 0; i0 &lt; xlen; i0++ ) {
482-
tmp += A[ oa+(sa0*i0) ] * x[ ix1 ];
483-
ix1 += strideX;
603+
tmp += A[ ia ] * x[ ix ];
604+
ix += strideX;
605+
ia += da0;
484606
}
485-
y[ iy1 ] += alpha * tmp;
486-
iy1 += strideY;
607+
y[ iy ] += alpha * tmp;
608+
iy += strideY;
609+
ia += da1;
487610
}
488611
return y;
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}
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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 2025-06-28T16:28:10.574Z
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at 2025-06-29T10:49:20.753Z
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</div>
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<script src="../../../../prettify.js"></script>
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<script>

‎blas/base/dgemv/coverage.ndjson‎

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[627,627,100,68,68,100,5,5,100,627,627,100,"e62310ca814d3ff297215dffcc8dd0be4d143972","2025-06-28 21:56:37 +0530"]
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[667,668,99.8503,73,74,98.6486,6,6,100,667,668,99.8503,"02979c086d0d13af5d85231d95fe219bc3cea848","2025-06-29 03:47:01 -0700"]

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