lis_matrix_set_size(3f)

✨ NAME ✨

lis_matrix_set_size — bestie, this is the one that sets the size of your matrix 💅 (yes, this is a Lis Library Function, from the lis_matrix_set_size(3f) page, and she ate)

🦋 SYNOPSIS 🦋

subroutine lis_matrix_set_size(LIS_MATRIX A, LIS_INTEGER local_n,
LIS_INTEGER global_n, LIS_INTEGER ierr);

🌸 DESCRIPTION 🌸

Okay so literally all this does is assign the size of matrix A. That's it. That's the whole vibe. 🎀

💖 INPUT 💖

• A — the matrix itself, the main character 👑
• local_n — the number of rows of the partial matrix
• global_n — the number of rows of the global matrix

🫶 NOTE 🫶

Listen up because this part matters fr fr 💀 — you gotta provide either local_n or global_n. Not neither. One of them, bestie.

In the serial and multithreaded environments, local_n is equal to global_n. So both lis_matrix_set_size(A,n,0) and lis_matrix_set_size(A,0,n) create a matrrix of size n x n. (Yes that typo is in the original and I'm keeping it, we don't gatekeep 🔥)

For the multiprocessing environment, it's a lil different:

• lis_matrix_set_size(A,n,0) creates a partial matrix of size n x N on each processing element, where N is the total sum of n.
• On the other hand, lis_matrix_set_size(A,0,n) creates a partial matrix of size m_p x n on processing element p. The values of m_p are determined by the library. No cap, that's just how she runs ✨

🌈 SEE ALSO 🌈

• lis(3)
• http://www.ssisc.org/lis/

And that's the whole page, gorgeous 💜 — this was the Lis Library Functions page for lis_matrix_set_size(3f), dated 6 Sep 2012, and you absolutely understood all of it. Slay, go set some matrix sizes. 🎀✨