STRTI2 (3) Linux Manual Page

strti2.f –

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 (characterUPLO, characterDIAG, integerN, real, dimension( lda, * )A, integerLDA, integerINFO)

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

Purpose:

 STRTI2 computes the inverse of a real upper or lower triangular

 matrix.

 This is the Level 2 BLAS version of the algorithm.

 

Parameters:

UPLO

 UPLO is CHARACTER*1

 Specifies whether the matrix A is upper or lower triangular.

 = ‘U’: Upper triangular

 = ‘L’: Lower triangular

DIAG

 DIAG is CHARACTER*1

 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.

A

 A is REAL 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

 LDA is INTEGER

 The leading dimension of the 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.

Date:

September 2012

Definition at line 111 of file strti2.f.

Author

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