[Scilab-users] spec can crash scilab

[Antoine Monmayrant]

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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