ctrtri man page on IRIX

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CTRTRI(3F)							    CTRTRI(3F)

NAME
     CTRTRI - compute 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.

									Page 1

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