NAME

       ztrti2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine ztrti2 (UPLO, DIAG, N, A, LDA, INFO)
           ZTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

Function/Subroutine Documentation

   subroutine ztrti2 (character UPLO, character DIAG, integer N, complex*16, dimension( lda, * )
       A, integer LDA, integer INFO)
       ZTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

       Purpose:

            ZTRTI2 computes the inverse of a complex 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 COMPLEX*16 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

Author

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