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@@ -281,13 +203,17 @@ <h1><a href="../../../../index.html">All files</a> / <a href="index.html">lapack
281203
282204// MODULES //
283205
284- var isRowMajor = require( '@stdlib/ndarray /base/assert/is-row-major ' );
206+ var iladlr = require( '@stdlib/lapack /base/iladlr ' ).ndarray ;
285207
286208
287209// MAIN //
288210
289211/**
290- * Finds the index of the last non zero column in a matrix `A`.
212+ * Returns the index of the last non-zero column in a matrix `A`.
213+ *
214+ * ## Notes
215+ *
216+ * - If provided an empty matrix or a matrix containing only zeros, the function returns `-1` (i.e., an invalid index).
291217*
292218* @private
293219* @param {PositiveInteger} M - number of rows in `A`
@@ -296,7 +222,7 @@ <h1><a href="../../../../index.html">All files</a> / <a href="index.html">lapack
296222* @param {integer} strideA1 - stride of the first dimension of `A`
297223* @param {integer} strideA2 - stride of the second dimension of `A`
298224* @param {NonNegativeInteger} offsetA - index offset for `A`
299- * @returns {integer} index of the last non zero column
225+ * @returns {integer} index of the last non- zero column
300226*
301227* @example
302228* var Float64array = require( '@stdlib/array/float64' );
@@ -307,50 +233,7 @@ <h1><a href="../../../../index.html">All files</a> / <a href="index.html">lapack
307233* // returns 1
308234*/
309235function iladlc( M, N, A, strideA1, strideA2, offsetA ) {
310- var ia1;
311- var ia2;
312- var i;
313- var j;
314-
315- if ( M === 0 || N === 0 ) {
316- return -1; // Invalid index
317- }
318-
319- ia1 = offsetA + ( (N-1) * strideA2 ); // A( 1, N )
320- ia2 = ia1 + ( (M-1) * strideA1 ); // A( M, N )
321-
322- // Quick test for common case where corners are non-zero:
323- if ( A[ ia1 ] !== 0.0 || A[ ia2 ] !== 0.0 ) < span class ="branch-0 cbranch-no " title ="branch not covered " > {</ span >
324- < span class ="cstat-no " title ="statement not covered " > return N - 1;</ span >
325- < span class ="cstat-no " title ="statement not covered " > }</ span >
326-
327- if ( isRowMajor( [ strideA1, strideA2 ] ) ) {
328- ia1 = offsetA;
329- for ( i = 0; i < M; i++ ) {
330- ia2 = ( N - 1 ) * strideA2;
331- for ( j = N-1; j >= 0; j-- ) {
332- if ( A[ ia1 + ia2 ] !== 0.0 ) {
333- return j;
334- }
335- ia2 -= strideA2;
336- }
337- ia1 += strideA1;
338- }
339- } else {
340- ia1 = offsetA + ( (N-1) * strideA2 );
341- for ( i = N-1; i >= 0; i-- ) {
342- ia2 = 0;
343- for ( j = 0; j < M; j++ ) {
344- if ( A[ ia1 + ia2 ] !== 0.0 ) {
345- return i;
346- }
347- ia2 += strideA1;
348- }
349- ia1 -= strideA2;
350- }
351- }
352-
353- return -1;
236+ return iladlr( N, M, A, strideA2, strideA1, offsetA );
354237}
355238
356239
@@ -364,7 +247,7 @@ <h1><a href="../../../../index.html">All files</a> / <a href="index.html">lapack
364247 < div class ='footer quiet pad2 space-top1 center small '>
365248 Code coverage generated by
366249 < a href ="https://istanbul.js.org/ " target ="_blank " rel ="noopener noreferrer "> istanbul</ a >
367- at 2025-06-05T09:03:05.018Z
250+ at 2025-06-06T09:32:37.538Z
368251 </ div >
369252 < script src ="../../../../prettify.js "> </ script >
370253 < script >
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