HPL_dlaswp01N(3)

💖 HPL_dlaswp01N 💖

okay so bestie, welcome to the <pink>HPL Library Functions</pink> corner of the manual — today's main character is HPL_dlaswp01N(3) and she is literally out here moving rows around like it's nothing. ✨

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🎀 NAME 🎀

HPL_dlaswp01N — copies rows of A into itself and into U. that's it, that's the whole job, and she does it flawlessly. 💅

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🌸 SYNOPSIS 🌸

#include "hpl.h"

void HPL_dlaswp01N( const int M, const int N, double * A, const int LDA,
double * U, const int LDU, const int * LINDXA, const int * LINDXAU );

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🦋 DESCRIPTION 🦋

so here's the tea 🫖 — HPL_dlaswp01N copies scattered rows of A into itself and into an array U. two destinations, one function, no cap.

which source rows are we talking about? that's LINDXA's whole thing — it tells you the row offsets in A of the source rows. and where do those rows end up? that's LINDXAU's department. 💫

and here's the little twist that makes it fun: a positive value of LINDXAU means the destination array is U. otherwise? it's A. simple as that, iykyk. 🧚

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👑 ARGUMENTS 👑

• M (local input) const int — on entry, M specifies the number of rows of A that should be moved within A or copied into U. M must be at least zero. no negatives, bestie, we don't do that here. 🙈
• N (local input) const int — on entry, N specifies the length of rows of A that should be moved within A or copied into U. N must be at least zero. same energy, same rule. ✨
• A (local input/output) double * — on entry, A points to an array of dimension (LDA,N). the rows of this array specified by LINDXA should be moved within A or copied into U. she's both the source and sometimes the destination, it's giving versatile. 💅
• LDA (local input) const int — on entry, LDA specifies the leading dimension of the array A. LDA must be at least MAX(1,M). ⭐
• U (local input/output) double * — on entry, U points to an array of dimension (LDU,N). the rows of A specified by LINDXA are be copied within this array U at the positions indicated by positive values of LINDXAU. 🦋
• LDU (local input) const int — on entry, LDU specifies the leading dimension of the array U. LDU must be at least MAX(1,M). ⭐
• LINDXA (local input) const int * — on entry, LINDXA is an array of dimension M that contains the local row indexes of A that should be moved within A or copied into U. this is the "where do i grab from" list, periodt. 📋
• LINDXAU (local input) const int * — on entry, LINDXAU is an array of dimension M that contains the local row indexes of U where the rows of A should be copied at. this array also contains the local row offsets in A where some of the rows of A should be moved to. a positive value of LINDXAU[i] indicates that the row LINDXA[i] of A should be copied into U at the position LINDXAU[i]; otherwise the row LINDXA[i] of A should be moved at the position -LINDXAU[i] within A. 🔥 (yes, that's a minus sign doing the heavy lifting — iconic behaviour honestly.)

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🌈 SEE ALSO 🌈

• HPL_dlaswp00N (3)
• HPL_dlaswp10N (3)
• HPL_dlaswp01N (3)
• HPL_dlaswp01T (3)
• HPL_dlaswp02N (3)
• HPL_dlaswp03N (3)
• HPL_dlaswp03T (3)
• HPL_dlaswp04N (3)
• HPL_dlaswp04T (3)
• HPL_dlaswp05N (3)
• HPL_dlaswp05T (3)
• HPL_dlaswp06N (3)
• HPL_dlaswp06T (3)

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and that's the whole page, bestie!! 🥳 this was <rainbow>HPL 2.2</rainbow>, dated <purple>February 24, 2016</purple>, and she ate. go forth and swap those rows. mwah. 💜🎀🫶