xerbla.f(3) LAPACK xerbla.f(3)NAME
xerbla.f -
SYNOPSIS
Functions/Subroutines
subroutine xerbla (SRNAME, INFO)
XERBLA
Function/Subroutine Documentation
subroutine xerbla (character*(*)SRNAME, integerINFO)
XERBLA
Purpose:
XERBLA is an error handler for the LAPACK routines.
It is called by an LAPACK routine if an input parameter has an
invalid value. A message is printed and execution stops.
Installers may consider modifying the STOP statement in order to
call system-specific exception-handling facilities.
Parameters:
SRNAME
SRNAME is CHARACTER*(*)
The name of the routine which called XERBLA.
INFO
INFO is INTEGER
The position of the invalid parameter in the parameter list
of the calling routine.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 71 of file SRC/xerbla.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 xerbla.f(3)
Check Out this Related Man Page
dsterf.f(3) LAPACK dsterf.f(3)NAME
dsterf.f -
SYNOPSIS
Functions/Subroutines
subroutine dsterf (N, D, E, INFO)
DSTERF
Function/Subroutine Documentation
subroutine dsterf (integerN, double precision, dimension( * )D, double precision, dimension( * )E, integerINFO)
DSTERF
Purpose:
DSTERF computes all eigenvalues of a symmetric tridiagonal matrix
using the Pal-Walker-Kahan variant of the QL or QR algorithm.
Parameters:
N
N is INTEGER
The order of the matrix. N >= 0.
D
D is DOUBLE PRECISION array, dimension (N)
On entry, the n diagonal elements of the tridiagonal matrix.
On exit, if INFO = 0, the eigenvalues in ascending order.
E
E is DOUBLE PRECISION array, dimension (N-1)
On entry, the (n-1) subdiagonal elements of the tridiagonal
matrix.
On exit, E has been destroyed.
INFO
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
> 0: the algorithm failed to find all of the eigenvalues in
a total of 30*N iterations; if INFO = i, then i
elements of E have not converged to zero.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 87 of file dsterf.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dsterf.f(3)
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