SRC/dtrti2.f(3)

okay bestie, welcome to SRC/dtrti2.f from the Library Functions Manual — this page is all about one LAPACK subroutine, and the vibe is unblocked-inverse realness ✨

🌸 NAME 🌸

SRC/dtrti2.f

✨ SYNOPSIS ✨

🧚 Functions/Subroutines 🧚

• subroutine dtrti2 (uplo, diag, n, a, lda, info) — DTRTI2 computes the inverse of a triangular matrix (unblocked algorithm). 💅

🦋 Function/Subroutine Documentation 🦋

subroutine dtrti2 (character uplo, character diag, integer n, double precision, dimension( lda, * ) a, integer lda, integer info)

DTRTI2 computes the inverse of a triangular matrix (unblocked algorithm). 👑

🎯 Purpose 🎯

DTRTI2 computes the inverse of a real upper or lower triangular matrix.

This is the Level 2 BLAS version of the algorithm.

🎀 Parameters 🎀

• UPLO — is CHARACTER*1. Specifies whether the matrix A is upper or lower triangular.
  • = 'U': Upper triangular
  • = 'L': Lower triangular
• DIAG — is CHARACTER*1. Specifies whether or not the matrix A is unit triangular.
  • = 'N': Non-unit triangular
  • = 'U': Unit triangular
• N — is INTEGER. The order of the matrix A. N >= 0.
• A — is DOUBLE PRECISION array, dimension (LDA,N). On entry, 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.

• LDA — is INTEGER. The leading dimension of the array A. LDA >= max(1,N).
• 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 dtrti2.f.

👑 Author 👑

Generated automatically by Doxygen for LAPACK from the source code.

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