chetri man page on IRIX

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CHETRI(3F)							    CHETRI(3F)

NAME
     CHETRI - compute the inverse of a complex Hermitian indefinite matrix A
     using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF

SYNOPSIS
     SUBROUTINE CHETRI( UPLO, N, A, LDA, IPIV, WORK, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 INTEGER	IPIV( * )

	 COMPLEX	A( LDA, * ), WORK( * )

PURPOSE
     CHETRI computes the inverse of a complex Hermitian indefinite matrix A
     using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF.

ARGUMENTS
     UPLO    (input) CHARACTER*1
	     Specifies whether the details of the factorization are stored as
	     an upper or lower triangular matrix.  = 'U':  Upper triangular,
	     form is A = U*D*U**H;
	     = 'L':  Lower triangular, form is A = L*D*L**H.

     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     A	     (input/output) COMPLEX array, dimension (LDA,N)
	     On entry, the block diagonal matrix D and the multipliers used to
	     obtain the factor U or L as computed by CHETRF.

	     On exit, if INFO = 0, the (Hermitian) inverse of the original
	     matrix.  If UPLO = 'U', the upper triangular part of the inverse
	     is formed and the part of A below the diagonal is not referenced;
	     if UPLO = 'L' the lower triangular part of the inverse is formed
	     and the part of A above the diagonal is not referenced.

     LDA     (input) INTEGER
	     The leading dimension of the array A.  LDA >= max(1,N).

     IPIV    (input) INTEGER array, dimension (N)
	     Details of the interchanges and the block structure of D as
	     determined by CHETRF.

     WORK    (workspace) COMPLEX array, dimension (N)

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

									Page 1

CHETRI(3F)							    CHETRI(3F)

	     > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
	     inverse could not be computed.

									Page 2

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