lis_array_matvec(3f)

💖 lis_array_matvec — the matrix-vector product page 💖

okay bestie, this is a Lis Library Functions situation and the whole thing lives under lis_array_matvec(3f). it's giving "multiply a matrix by a vector and vibe" ✨ let's GO 🦋

✨ NAME ✨

lis_array_matvec — calculate the matrix vector product 🔥

🌸 SYNOPSIS 🌸

subroutine lis_array_matvec(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR
x(), LIS_SCALAR y(), LIS_INTEGER op, LIS_INTEGER ierr);

💅 DESCRIPTION 💅

so basically: it calculates the matrix-vector product Ax. that's it, that's the whole gig. iconic honestly 💜

🎀 INPUT 🎀

• n — the size of the matrix and the vectors. the girlboss dimension, if you will 👑
• a — the array that stores matrix A, and it's size n * n (yes, square, she's committed 💖)
• x — the array that stores vector x, size n ✨
• y — the array that stores vector y, size n 🦋
• op — the operation selector, and it has exactly two moods:
  • LIS_INS_VALUE — y = Ax (fresh y, insert the product, main character energy 🫶)
  • LIS_SUB_VALUE — y = y - Ax (subtract the product from the y you already had, very "we're building on what exists" of her 💅)

🌈 OUTPUT 🌈

• y — y 😌 (yes bestie, she writes right back into y, the glow-up is in place ✨)

⭐ SEE ALSO ⭐

• lis(3)
• http://www.ssisc.org/lis/

and that's the whole page, no cap 💀💖 this was the Man Page, dated 3 Dec 2014, and it's lis_array_matvec(3f) from the Lis Library Functions era. slay, drink water, and may your matrices always be square 🧚🌸🍓