debian man page for cgetri

cgetri.f(3)							      LAPACK							       cgetri.f(3)

NAME
       cgetri.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cgetri (N, A, LDA, IPIV, WORK, LWORK, INFO)
	   CGETRI

Function/Subroutine Documentation
   subroutine cgetri (integerN, complex, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex, dimension( * )WORK, integerLWORK,
       integerINFO)
       CGETRI

       Purpose:

	    CGETRI computes the inverse of a matrix using the LU factorization
	    computed by CGETRF.

	    This method inverts U and then computes inv(A) by solving the system
	    inv(A)*L = inv(U) for inv(A).

       Parameters:
	   N

		     N is INTEGER
		     The order of the matrix A.  N >= 0.

	   A

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

	   LDA

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

	   IPIV

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

	   WORK

		     WORK is COMPLEX array, dimension (MAX(1,LWORK))
		     On exit, if INFO=0, then WORK(1) returns the optimal LWORK.

	   LWORK

		     LWORK is 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

		     INFO is 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.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 115 of file cgetri.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       cgetri.f(3)