STRTI2(3)

📦 version 3.12.0, in opensuse-leap 16.0

💅 STRTI2(3) 💅

okay so this page is STRTI2(3) from the Library Functions Manual, bestie. It's giving triangular matrix inverse, but make it unblocked. 💖

🌸 NAME 🌸

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/strti2.f

That's the file this whole page is about. 🎀

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

subroutine STRTI2 (uplo, diag, n, a, lda, info)
    STRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

💖 Function/Subroutine Documentation 💖

🦋 subroutine STRTI2 🦋

subroutine STRTI2 (character uplo, character diag, integer n, real, dimension( lda, * ) a, integer lda, integer info)

STRTI2 computes the inverse of a triangular matrix with the unblocked algorithm. no cap. ✨

🌟 Purpose 🌟

STRTI2 computes the inverse of a real upper or lower triangular matrix. It is the Level 2 BLAS version of the algorithm. periodt. 🔥

🌸 Parameters 🌸

UPLO

UPLO is CHARACTER*1. It specifies whether matrix A is upper or lower triangular:

  • = 'U': Upper triangular
  • = 'L': Lower triangular

DIAG

DIAG is CHARACTER*1. It specifies whether or not matrix A is unit triangular:

  • = 'N': Non-unit triangular
  • = 'U': Unit triangular

N

N is INTEGER. The order of matrix A. N >= 0.

A

A is REAL array, dimension (LDA,N). On entry, it's the triangular matrix A.

  • If UPLO = 'U', the leading n by n upper triangular part of 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 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, it's the (triangular) inverse of the original matrix, in the same storage format. 💅

LDA

LDA is INTEGER. The leading dimension of array A. LDA >= max(1,N).

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 of file strti2.f.

🫶 Author 🫶

Generated automatically by Doxygen for LAPACK from the source code.

okay that's the whole page, bestie. The footer sign-off is LAPACK, Version 3.12.0, and the date slot is literally /home/abui...RC/strti2.f(3). 🦋✨

📦 where this page comes from