lis_array_matvec_ns(3)

💖 lis_array_matvec_ns(3) — from the Lis Library Functions 💖

okay bestie, sit down, hydrate, and let me tell you about lis_array_matvec_ns — the matrix-vector product girlie who does not require a square matrix, and honestly? iconic behavior. 🦋

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✨ SYNOPSIS ✨

#include "lis.h"

LIS_INT lis_array_matvec_ns(LIS_INT m, LIS_INT n, LIS_SCALAR a[],
LIS_INT lda, LIS_SCALAR x[], LIS_SCALAR y[]);

like yes, that's the whole signature, no cap. 🫶

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🌸 DESCRIPTION 🌸

So basically this function calculates the matrix-vector product Ax, where the matrix A is not square. That's literally the whole point — it's giving "rectangle rights" and we love that for her. 💅

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🎀 INPUT 🎀

• m, n — the size of the matrix and the vectors, periodt.
• a — the array that stores matrix A, of size m * n. yes, m times n, keep up bestie 🍓
• x — the array that stores vector x, of size n.
• y — the array that stores vector y, of size m.
• op — the vibe selector, and there are exactly two moods:
  • LIS_INS_VALUE — means y = Ax ✨
  • LIS_SUB_VALUE — means y = y - Ax 💀

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💜 OUTPUT 💜

• y — it's y. that's it. that's the output. she returns y. 🎀

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🔥 EXIT STATUS 🔥

these are the exit values she hands back to you:

• 0 — the process is normally terminated. slay, everything worked, we're so back. 👑
• unspecified — an error occurred. not the moment, not the vibe, go check your inputs bestie 😭

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🌈 SEE ALSO 🌈

• lis(3)
• http://www.ssisc.org/lis/

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lowkey a reminder from your girl: A is not square here. that is not a bug, that is the entire personality of this function. do not come for her. 🙈

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Man Page — 3 Dec 2014 🦋 and that's the tea, bestie — go forth and multiply (matrices, specifically). mwah 💖✨