lis_array_solve(3f)

lis_array_solve(3f) 💖

okay bestie, so this is a page from the Lis Library Functions manual — yes, that Lis, the library that does the math so you don't have to 💅. It's a Fortran-callable joint, and it's about to solve your linear equation with the direct method. no cap. sit down, grab a boba 🍓, and let's get into it.

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✨ NAME ✨

lis_array_solve — solve the linear equation with the direct method 🎀

literally what it says on the tin. it solves. directly. iconic behavior.

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🦋 SYNOPSIS 🦋

subroutine lis_array_solve(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR
b(), LIS_SCALAR x(), LIS_SCALAR w(), LIS_INTEGER ierr);

that's the whole vibe right there ⭐ six things go in, the universe does its thing, and x comes back blessed.

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🌸 DESCRIPTION 🌸

Solve the linear equation Ax=b with the specified solver. 🧚

that's the mission. that's the whole plot. you hand it a matrix A and a right hand side b, and it goes and finds you an x like the main character it is. 👑

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💜 INPUT 💜

the stuff you gotta bring to the function. pack your bags, bestie 🎒

• n — The size of the matrix 🫶 like, it's an n by n situation. square. balanced. symmetric-ish energy (not literally, don't come for me).
• a — The array that stores coefficient matrix A of size n * n ✨ the big one. the star of the show. every coefficient, all dressed up in one array.
• b — The array that stores right hand side vector b of size n 🌈 the "answer before the answer," yk? the thing on the other side of the equals sign.
• w — The work array w of size n 🧹 the work array!! it's the backstage crew of this whole operation. it doesn't get credit but nothing runs without it. give it its flowers 💐

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👑 OUTPUT 👑

• x — The array that stores solution x 💖 THERE SHE IS. the solution. the moment we've all been waiting for. the finale. the girlboss of the whole page. 🎀

side note, bestie: ierr shows up in the synopsis but doesn't get its own lil description in the input or output lists, so don't come at me — I'm just telling you what the page tells you. 🙈

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💀 SEE ALSO 💀

• lis(3) — the parent page, the origin story, the mothership 🛸
• http://www.ssisc.org/lis/ — go touch grass (digitally) at the source 🌱

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and that's the whole page, bestie!! every option, every array, every size — nothing dropped, nothing skipped, periodt. 💅

this lil beauty comes from the Lis Library Functions manual, dated 6 Sep 2012, and it lives on the lis_array_solve(3f) man page. slay, stay solving, and may all your As be well-conditioned 🦋✨💖