Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3 - 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
                = 'U':  A is upper triangular;
                = 'L':  A is lower triangular.

        DIAG    (input) CHARACTER*1
                = 'N':  A is non-unit triangular;
                = 'U':  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 = '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     (input) INTEGER
                The leading dimension of the array A.  LDA >= max(1,N).

        INFO    (output) 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.

 LAPACK routine (version 3.2)               April 2011                            CTRTRI(3lapack)