[Pw_forum] what is the meaning of the error " error in DGETRF"
y.k. zhou
ykzhou at gmail.com
Sat Dec 17 01:46:11 CET 2005
On 12/15/05, 针叶 朱 <coldwind1978 at yahoo.com.cn> wrote:
> Dear All users:
> i am new users, when i relax supperlattice "BaTiO3/SrTiO3", the error
> appeared: from invmat : error # 2
> error in DGETRF
> ,please tell me why?
>
Hi, dgetrf is a LAPACK subroutine for
LU factorization of a general matrix using
partial pivoting with row interchanges.
The output value of info for
SUBROUTINE DGETRF( M, N, A, LDA, IPIV, INFO )
is commented (in the source code) as:
* 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 factorization
* has been completed, but the factor U is exactly
* singular, and division by zero will occur if it is used
* to solve a system of equations.
regards,
-ykz
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