CTRTRI(3F)							    CTRTRI(3F)

NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	CTRTRI(	UPLO, DIAG, N, A, LDA, INFO )

	 CHARACTER	DIAG, UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     CTRTRI computes the inverse of a complex upper or lower triangular	matrix
     A.

     This is the Level 3 BLAS version of the algorithm.

ARGUMENTS    [Toc]    [Back]

     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.
CTRTRI(3F)							    CTRTRI(3F)

NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	CTRTRI(	UPLO, DIAG, N, A, LDA, INFO )

	 CHARACTER	DIAG, UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     CTRTRI computes the inverse of a complex upper or lower triangular	matrix
     A.

     This is the Level 3 BLAS version of the algorithm.

ARGUMENTS    [Toc]    [Back]

     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.


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