RedHat 9 (Linux i386) - man page for ztrtri (redhat section l)

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ZTRTRI(l)					)					ZTRTRI(l)

NAME
       ZTRTRI - compute the inverse of a complex upper or lower triangular matrix A

SYNOPSIS
       SUBROUTINE ZTRTRI( UPLO, DIAG, N, A, LDA, INFO )

	   CHARACTER	  DIAG, UPLO

	   INTEGER	  INFO, LDA, N

	   COMPLEX*16	  A( LDA, * )

PURPOSE
       ZTRTRI  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*16 array, dimension (LDA,N)
	       On entry, the triangular matrix A.  If UPLO = 'U', the leading N-by-N upper trian-
	       gular  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  diago-
	       nal  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 version 3.0			   15 June 2000 				ZTRTRI(l)
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