ZTRTI2(3F)							    ZTRTI2(3F)

NAME    [Toc]    [Back]

     ZTRTI2 - compute the inverse of a complex upper or	lower triangular
     matrix

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	ZTRTI2(	UPLO, DIAG, N, A, LDA, INFO )

	 CHARACTER	DIAG, UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX*16	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     ZTRTI2 computes the inverse of a complex upper or lower triangular
     matrix.

     This is the Level 2 BLAS version of the algorithm.

ARGUMENTS    [Toc]    [Back]

     UPLO    (input) CHARACTER*1
	     Specifies whether the matrix A is upper or	lower triangular.  =
	     'U':  Upper triangular
	     = 'L':  Lower triangular

     DIAG    (input) CHARACTER*1
	     Specifies whether or not the matrix A is unit triangular.	= 'N':
	     Non-unit triangular
	     = 'U':  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	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).






									Page 1






ZTRTI2(3F)							    ZTRTI2(3F)



     INFO    (output) INTEGER
	     = 0: successful exit
	     < 0: if INFO = -k,	the k-th argument had an illegal value
ZTRTI2(3F)							    ZTRTI2(3F)

NAME    [Toc]    [Back]

     ZTRTI2 - compute the inverse of a complex upper or	lower triangular
     matrix

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	ZTRTI2(	UPLO, DIAG, N, A, LDA, INFO )

	 CHARACTER	DIAG, UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX*16	A( LDA,	* )

PURPOSE    [Toc]    [Back]

     ZTRTI2 computes the inverse of a complex upper or lower triangular
     matrix.

     This is the Level 2 BLAS version of the algorithm.

ARGUMENTS    [Toc]    [Back]

     UPLO    (input) CHARACTER*1
	     Specifies whether the matrix A is upper or	lower triangular.  =
	     'U':  Upper triangular
	     = 'L':  Lower triangular

     DIAG    (input) CHARACTER*1
	     Specifies whether or not the matrix A is unit triangular.	= 'N':
	     Non-unit triangular
	     = 'U':  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	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).






									Page 1






ZTRTI2(3F)							    ZTRTI2(3F)



     INFO    (output) INTEGER
	     = 0: successful exit
	     < 0: if INFO = -k,	the k-th argument had an illegal value


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