lis_matrix_set_ell(3f)

✨ lis_matrix_set_ell — bestie, let's bind those ELL arrays 💅

okay so this is a page from the Lis Library Functions manual, section 3f — yes it's a Fortran subroutine, and yes it's iconic. sit down, hydrate, we're learning 💖

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🌸 NAME 🌸

lis_matrix_set_ell — it takes the arrays you've got hanging out in ELL format and associates them with the matrix. like, introduces them. makes it official. 🫶

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✨ SYNOPSIS ✨

subroutine lis_matrix_set_ell(LIS_INTEGER maxnzr, LIS_INTEGER index[],
LIS_SCALAR value[], LIS_MATRIX A, LIS_INTEGER ierr);

that's the whole vibe check right there 👑

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💖 DESCRIPTION 💖

So what it does is literally this: it associates the arrays in the ELL format with matrix A. that's it. that's the whole function. and honestly? slay. 🌈

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🎀 INPUT 🎀

• maxnzr — the max number of nonzero elements in each row. the ceiling. the limit. the "how much can one row hold" number. 📏
• index, value — the arrays in the ELL format. the actual data besties. the receipts. 💅
• A — the matrix. main character energy tbh. 👑

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🦋 OUTPUT 🦋

• A — the matrix, now associated with the arrays. they're bonded. it's giving soulmate. 💞

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⚠️ NOTE ⚠️

okay so this part is NOT optional and I need you to hear me: after lis_matrix_set_ell is called, you must call the function lis_matrix_assemble. no skipping. no "I'll do it later". the assemble call is mandatory, fr fr. 😭

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👀 SEE ALSO 👀

• lis(3)
• http://www.ssisc.org/lis/

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and that's the page, bestie 🧚 go forth and assemble your matrices 💜

this has been your girl, signing off from the Lis Library Functions corner of the manual, dated 6 Sep 2012 — the man page footer said so and I would never lie to you 🎀✨🌸