Hello all,
I might have found a workaround, but I still need to ensure that I get
exactly the same end results in my code.
It seems that I can replace:
[W2, gammas] = spec(A); //crashes
by
[al,be,W2]=spec(A,eye(A)); //fine
gammas=diag(al./be);
If anyone has a solution with eigs, I'll take it.
Could my workaround help investigate where the bug is in the gateway
between scilab and lapack?
Cheers,
Antoine
On 05/05/2021 08:22, Antoine Monmayrant wrote:
On 05/05/2021 00:09, Samuel Gougeon wrote:
Le 04/05/2021 à 16:38, Antoine Monmayrant a écrit :
Yes, it does the same
So this bug is still a problem, at least on Ubuntu.
Can you guys try to run spec.tst on his machine and comment on
https://bugzilla.scilab.org/show_bug.cgi?id=15330 ?
Hello Samuel,
Besides, how confusing and messy the notations on the spec ()
documentation page are! ...
* R defined twice but differently among arguments
* L defined among arguments but not used in syntaxes
* Q and Z used in syntaxes but not described among arguments
* al, be used in descriptions, instead of alpha and beta listed in
arguments
* E used in the description, but not in arguments nor in syntaxes...
and so on..
In addition, notations differ from a language version to another one...
Some clarification is urgently required.
Indeed.
It is also a big problem for portability to get such a basic
functionality (solving eigenvalue problems in a linear algebra
software!) only working on some platforms!
In next release, eigs() -- mainly based on the former Arnoldi module,
that becomes internal -- is listed in the same help section. Have you
tried it?
Well, I might be a bit far from my field of expertise, but it does not
seem that eigs can compute all the eigenvalues/eigenvectors, does it?
It seems that by default it computes the 6 biggest ones and can go up
to rank(A)-2.
In my use case, I need all the eigenvalues...
Antoine
Samuel
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