LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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ctrtri.f File Reference

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Functions/Subroutines

subroutine ctrtri (UPLO, DIAG, N, A, LDA, INFO)
 CTRTRI

Function/Subroutine Documentation

subroutine ctrtri ( character  UPLO,
character  DIAG,
integer  N,
complex, dimension( lda, * )  A,
integer  LDA,
integer  INFO 
)

CTRTRI

Download CTRTRI + dependencies [TGZ] [ZIP] [TXT]
Purpose: 
 CTRTRI computes the inverse of a complex upper or lower triangular
 matrix A.

 This is the Level 3 BLAS version of the algorithm.
Parameters:
[in]UPLO
          UPLO is CHARACTER*1
          = 'U':  A is upper triangular;
          = 'L':  A is lower triangular.
[in]DIAG
          DIAG is CHARACTER*1
          = 'N':  A is non-unit triangular;
          = 'U':  A is unit triangular.
[in]N
          N is INTEGER
          The order of the matrix A.  N >= 0.
[in,out]A
          A is COMPLEX 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.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
[out]INFO
          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -i, the i-th 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.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011

Definition at line 110 of file ctrtri.f.

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