CGETRI man page on Oracle

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```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

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 3.4.2			Tue Sep 25 2012			   cgetri.f(3)
```
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