SRC/cgetri.f(3)            Library Functions Manual            SRC/cgetri.f(3)

NAME
       SRC/cgetri.f

SYNOPSIS
   Functions/Subroutines
       subroutine cgetri (n, a, lda, ipiv, work, lwork, info)
           CGETRI

Function/Subroutine Documentation
   subroutine cgetri (integer n, complex, dimension( lda, * ) a, integer lda,
       integer, dimension( * ) ipiv, complex, dimension( * ) work, integer
       lwork, integer info)
       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.

       Definition at line 113 of file cgetri.f.

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

LAPACK                          Version 3.12.0                 SRC/cgetri.f(3)