LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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cget01.f File Reference

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Functions/Subroutines

subroutine cget01 (M, N, A, LDA, AFAC, LDAFAC, IPIV, RWORK, RESID)
 CGET01 More...
 

Function/Subroutine Documentation

subroutine cget01 ( integer  M,
integer  N,
complex, dimension( lda, * )  A,
integer  LDA,
complex, dimension( ldafac, * )  AFAC,
integer  LDAFAC,
integer, dimension( * )  IPIV,
real, dimension( * )  RWORK,
real  RESID 
)

CGET01

Purpose:
 CGET01 reconstructs a matrix A from its L*U factorization and
 computes the residual
    norm(L*U - A) / ( N * norm(A) * EPS ),
 where EPS is the machine epsilon.
Parameters
[in]M
          M is INTEGER
          The number of rows of the matrix A.  M >= 0.
[in]N
          N is INTEGER
          The number of columns of the matrix A.  N >= 0.
[in]A
          A is COMPLEX array, dimension (LDA,N)
          The original M x N matrix A.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,M).
[in,out]AFAC
          AFAC is COMPLEX array, dimension (LDAFAC,N)
          The factored form of the matrix A.  AFAC contains the factors
          L and U from the L*U factorization as computed by CGETRF.
          Overwritten with the reconstructed matrix, and then with the
          difference L*U - A.
[in]LDAFAC
          LDAFAC is INTEGER
          The leading dimension of the array AFAC.  LDAFAC >= max(1,M).
[in]IPIV
          IPIV is INTEGER array, dimension (N)
          The pivot indices from CGETRF.
[out]RWORK
          RWORK is REAL array, dimension (M)
[out]RESID
          RESID is REAL
          norm(L*U - A) / ( N * norm(A) * EPS )
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
November 2011

Definition at line 108 of file cget01.f.

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