f08fa
is the AD Library version of the primal routine
f08faf (dsyev).
Based (in the C++ interface) on overload resolution,
f08fa can be used for primal, tangent and adjoint
evaluation. It supports tangents and adjoints of first order.
Note: this function can be used with AD tools other than dco/c++. For details, please contact
NAG.
f08fa
is the AD Library version of the primal routine
f08faf (dsyev).
f08faf (dsyev) computes all the eigenvalues and, optionally, all the eigenvectors of a real
$n\times n$ symmetric matrix
$A$.
For further information see
Section 3 in the documentation for
f08faf (dsyev).
Anderson E, Bai Z, Bischof C, Blackford S, Demmel J, Dongarra J J, Du Croz J J, Greenbaum A, Hammarling S, McKenney A and Sorensen D (1999)
LAPACK Users' Guide (3rd Edition) SIAM, Philadelphia
https://www.netlib.org/lapack/lug
A brief summary of the AD specific arguments is given below. For the remainder, links are provided to the corresponding argument from the primal routine.
A tooltip popup for all arguments can be found by hovering over the argument name in
Section 2 and in this section.
f08fa uses the standard NAG
ifail mechanism. Any errors indicated via
info values returned by
f08faf may be indicated with the same value returned by
ifail. In addition, this routine may return:
- ${\mathbf{ifail}}=-89$
An unexpected AD error has been triggered by this routine. Please
contact
NAG.
See
Section 4.8.2 in the NAG AD Library Introduction for further information.
- ${\mathbf{ifail}}=-199$
The routine was called using a mode that has not yet been implemented.
- ${\mathbf{ifail}}=-443$
On entry: ad_handle is nullptr.
This check is only made if the overloaded C++ interface is used with arguments not of type double.
- ${\mathbf{ifail}}=-444$
A C++ exception was thrown.
The error message will show the details of the C++ exception text.
- ${\mathbf{ifail}}=-899$
Dynamic memory allocation failed for AD.
See
Section 4.8.1 in the NAG AD Library Introduction for further information.
Not applicable.
None.
A NAG AD Library example is not yet available, please refer to the
NAG AD Library Introduction for information on calling routines from the AD Library.