Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

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

ZGETRI(l)					)					ZGETRI(l)

NAME
       ZGETRI - compute the inverse of a matrix using the LU factorization computed by ZGETRF

SYNOPSIS
       SUBROUTINE ZGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )

	   INTEGER	  INFO, LDA, LWORK, N

	   INTEGER	  IPIV( * )

	   COMPLEX*16	  A( LDA, * ), WORK( * )

PURPOSE
       ZGETRI  computes  the  inverse  of a matrix using the LU factorization computed by ZGETRF.
       This method inverts U and then computes inv(A) by solving the system inv(A)*L = inv(U) for
       inv(A).

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

       A       (input/output) COMPLEX*16 array, dimension (LDA,N)
	       On  entry,  the	factors  L  and U from the factorization A = P*L*U as computed by
	       ZGETRF.	On exit, if INFO = 0, the inverse of the original matrix A.

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

       IPIV    (input) INTEGER array, dimension (N)
	       The pivot indices from ZGETRF; for 1<=i<=N, row i of the matrix	was  interchanged
	       with row IPIV(i).

       WORK    (workspace/output) COMPLEX*16 array, dimension (LWORK)
	       On exit, if INFO=0, then WORK(1) returns the optimal LWORK.

       LWORK   (input) INTEGER
	       The  dimension  of  the	array  WORK.  LWORK >= max(1,N).  For optimal performance
	       LWORK >= N*NB, where NB is the optimal blocksize returned by ILAENV.

	       If LWORK = -1, then a workspace query is assumed; the routine only calculates  the
	       optimal	size of the WORK array, returns this value as the first entry of the WORK
	       array, and no error message related to LWORK is issued by XERBLA.

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value
	       > 0:  if INFO = i, U(i,i) is exactly zero; the matrix is singular and its  inverse
	       could not be computed.

LAPACK version 3.0			   15 June 2000 				ZGETRI(l)


All times are GMT -4. The time now is 04:17 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password