ctrtri (l)  Linux Manuals
ctrtri: computes the inverse of a complex upper or lower triangular matrix A
Command to display ctrtri
manual in Linux: $ man l ctrtri
NAME
CTRTRI  computes the inverse of a complex upper or lower triangular matrix A
SYNOPSIS
 SUBROUTINE CTRTRI(

UPLO, DIAG, N, A, LDA, INFO )

CHARACTER
DIAG, UPLO

INTEGER
INFO, LDA, N

COMPLEX
A( LDA, * )
PURPOSE
CTRTRI computes the inverse of a complex upper or lower triangular
matrix A.
This is the Level 3 BLAS version of the algorithm.
ARGUMENTS
 UPLO (input) CHARACTER*1

= aqUaq: A is upper triangular;
= aqLaq: A is lower triangular.
 DIAG (input) CHARACTER*1

= aqNaq: A is nonunit triangular;
= aqUaq: A is unit triangular.
 N (input) INTEGER

The order of the matrix A. N >= 0.
 A (input/output) COMPLEX array, dimension (LDA,N)

On entry, the triangular matrix A. If UPLO = aqUaq, the
leading NbyN 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 = aqLaq, the
leading NbyN 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 = aqUaq, 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 (input) INTEGER

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

= 0: successful exit
< 0: if INFO = i, the ith argument had an illegal value
> 0: if INFO = i, A(i,i) is exactly zero. The triangular
matrix is singular and its inverse can not be computed.
Pages related to ctrtri
 ctrtri (3)
 ctrtrs (l)  solves a triangular system of the form A * X = B, A**T * X = B, or A**H * X = B,
 ctrti2 (l)  computes the inverse of a complex upper or lower triangular matrix
 ctrttf (l)  copies a triangular matrix A from standard full format (TR) to rectangular full packed format (TF)
 ctrttp (l)  copies a triangular matrix A from full format (TR) to standard packed format (TP)
 ctrcon (l)  estimates the reciprocal of the condition number of a triangular matrix A, in either the 1norm or the infinitynorm
 ctrevc (l)  computes some or all of the right and/or left eigenvectors of a complex upper triangular matrix T
 ctrexc (l)  reorders the Schur factorization of a complex matrix A = Q*T*Q**H, so that the diagonal element of T with row index IFST is moved to row ILST