SRC/strti2.f(3)

🎀 NAME 🎀

okay so this whole page is about SRC/strti2.f, and it’s living in the Library Functions Manual — very “math girlie goes to the library” energy ✨. That’s the file, that’s the name, no cap.

---

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

• subroutine strti2 (uplo, diag, n, a, lda, info) — STRTI2 computes the inverse of a triangular matrix (unblocked algorithm). She’s doing the unblocked version, bestie — iconic behavior 💅.

---

🦋 Function/Subroutine Documentation 🦋

Here’s the full signature in all its main-character glory:

subroutine strti2 (character uplo, character diag, integer n, real, dimension( lda, * ) a, integer lda, integer info)

STRTI2 computes the inverse of a triangular matrix (unblocked algorithm). periodt 💖.

🌸 Purpose 🌸

STRTI2 computes the inverse of a real upper or lower triangular matrix. Lowkey a whole flex.

This is the Level 2 BLAS version of the algorithm. Very “iykyk” 🫶.

💖 Parameters 💖

• UPLO — UPLO is CHARACTER*1. It specifies whether the matrix A is upper or lower triangular:
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• DIAG — DIAG is CHARACTER*1. It specifies whether or not the matrix A is unit triangular:
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• N — N is INTEGER. The order of the matrix A. N >= 0. Yes, zero is allowed, she’s flexible 💅.
• A — A is REAL array, dimension (LDA,N). On entry, this is the triangular matrix A.
  • If UPLO = 'U', the leading n by n upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced.
  • If UPLO = 'L', the leading n by n lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced.
  • If DIAG = 'U', the diagonal elements of A are also not referenced and are assumed to be 1.
  • On exit, the (triangular) inverse of the original matrix, in the same storage format. She flips the matrix and keeps the vibe 😌✨.
• LDA — LDA is INTEGER. The leading dimension of the array A. LDA >= max(1,N). Respect the leading dimension, bestie 🫡.
• INFO — INFO is INTEGER.
  • = 0: successful exit
  • < 0: if INFO = -k, the k-th argument had an illegal value

👑 Author 👑

• Univ. of Tennessee
• Univ. of California Berkeley
• Univ. of Colorado Denver
• NAG Ltd.

📍 Definition at line 109 📍

Definition at line 109 of file strti2.f. Exactly there, not a line earlier, not a line later 💅.

---

🧚 Author 🧚

Generated automatically by Doxygen for LAPACK from the source code. Doxygen really said “I got this one” and pressed go 🤖💖.

---

okay final sign-off, bestie: this iconic little page is LAPACK Version 3.12.0, source file SRC/strti2.f(3) — mwah, slay, bye 💋🌈