lis_matrix_get_nnz(3f)

✨ lis_matrix_get_nnz(3f) — Lis Library Functions ✨

okay so bestie, welcome to the manual page for lis_matrix_get_nnz, one of the Lis Library Functions 💖 this one's a lil cutie and honestly it's giving "short and sweet, does exactly one thing" energy, and we LOVE that for it 🎀

---

💅 NAME 💅

lis_matrix_get_nnz — get the number of nonzero elements of the matrix

like. that's it. that's the job. count the nonzeros, hand you the number, no drama 🌸

---

🦋 SYNOPSIS 🦋

subroutine lis_matrix_get_nnz(LIS_MATRIX A, LIS_INTEGER *nnz,
LIS_INTEGER ierr);

okay so it's a subroutine, not a function, which means no return value, you get your answer through an argument instead, iykyk 👑

---

🌈 DESCRIPTION 🌈

Get the number of nonzero elements of matrix A.

that's literally the whole thing bestie. you hand it a matrix, it counts up all the elements that aren't zero, and it tells you how many there are. main character behavior, no cap 💅✨

---

🌸 INPUT 🌸

• A — the matrix 🫶 just, like, the matrix you're curious about

---

⭐ OUTPUT ⭐

• nnz — the number of nonzero elements 🔥 the number you came here for, the whole point of the entire operation

---

💀 NOTE 💀

okay so listen, this one's important:

For the multiprocessing environment, this function gets the number of nonzero elements of partial matrix A.

so if you're out here running in a multiprocessing environment, do NOT expect the global count, bestie 😭 you're getting the nonzero count of your local partial slice of A, which is lowkey a whole different number. plan accordingly 🙈

---

🧚 SEE ALSO 🧚

• lis(3)
• http://www.ssisc.org/lis/

---

and that's the whole page, bestie!! mwah 💜

this icon was brought to you by the Man Page, dated 28 Aug 2014, for lis_matrix_get_nnz(3f) — go forth and count your nonzeros responsibly, queen 👑✨