HPL_dlaswp05N(3)

✨ HPL_dlaswp05N — bestie edition ✨

okay so real quick: this is a page from the HPL Library Functions manual, and the star of the show is HPL_dlaswp05N(3). she's a lil workhorse in the HPL linear algebra lineup and today we're gonna get to know her 💖

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🌸 NAME 🌸

HPL_dlaswp05N — copy rows of U into A. that's it. that's the whole job. no cap.

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🦋 SYNOPSIS 🦋

#include "hpl.h"

void HPL_dlaswp05N( const int M, const int N, double * A, const int LDA,
const double * U, const int LDU, const int * LINDXA, const int * LINDXAU
);

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💅 DESCRIPTION 💅

so HPL_dlaswp05N copies rows of U of global offset LINDXAU into rows of A at positions indicated by LINDXA. that's the vibe. rows in, rows out, everyone gets where they're supposed to go ✨

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👑 ARGUMENTS 👑

• M — (local input) const int — on entry, M specifies the number of rows of U that should be copied into A. M must be at least zero. like, don't be weird about it, zero or more 🫶
• N — (local input) const int — on entry, N specifies the length of the rows of U that should be copied into A. N must be at least zero. same energy, zero is fine, negative is not 💀
• A — (local output) double * — on entry, A points to an array of dimension (LDA,N). on exit, the rows of this array specified by LINDXA are replaced by rows of U indicated by LINDXAU. she's the destination bestie, she's getting a glow-up 💖
• LDA — (local input) const int — on entry, LDA specifies the leading dimension of the array A. LDA must be at least MAX(1,M). rules are rules, she needs room to breathe ✨
• U — (local input/output) const double * — on entry, U points to an array of dimension (LDU,N). this array contains the rows that are to be copied into A. she's the source, the origin story, the blueprint 🌈
• LDU — (local input) const int — on entry, LDU specifies the leading dimension of the array U. LDU must be at least MAX(1,M). same deal as LDA, keep it legal 💅
• 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 copied from U. this is the "where do the new rows go in A" list 📍
• LINDXAU — (local input) const int * — on entry, LINDXAU is an array of dimension M that contains the local row indexes of U that should be copied in A. and this is the "which rows of U are we pulling from" list 📍

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🎀 SEE ALSO 🎀

the whole girlies squad, go say hi:

• 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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fr fr, that's the whole page. go copy some rows, you're gonna eat 💅✨

and that's a wrap, babe 🫶 this was HPL 2.2, dated February 24, 2016 — iconic behavior honestly, periodt 💖🌸