[Scilab-users] sparse in Scilab 6.0.0

[Samuel Gougeon]

Hi,

Le 08/07/2017 à 10:00, Pinçon Bruno a écrit :
> Le 08/07/2017 à 04:13, Taiji HAGIWARA a écrit :
>> Dear all,
>>
>> I have a question on "sparse" function in ver.6.0.0
>> Sparse function in ver.6.0.0 returns different answer compared to 
>> ver.5.2.2.  I am using Scilab 6.0.0 on Windows 10 (64bit)
>>
>> When we set same (i,j) factor twice or more,
>> ie.
>> ij=[i1,j1;
>>     i1,j1]
>> v=[a1;
>>     a2]
>>
>> Scilab 5.5.2 used to return the sum of corresponding value, a1+a2.
>> But Scilab 6.0.0 now returns the last entry, a2.
>>
>> Is it a bug?
>> Otherwise, is it a intended revision?
>
>       Hi all,
>
>     If it is the case, it's for sure a very bad idea : the sum feature
>    of the sparse function is used to build finite element matrices fastly
>    in those softwares (matlab like). At least the usual behavior could be
>   changed by an additionnal option parameter (with the default set to
>   get the old behavior).

 From a general non-sparse and non-finite-element point of view, this 
feature looks like a hack.
Now, it has never been documented in Scilab. Then, it was considered and 
reported as a bug
@ http://bugzilla.scilab.org/7675
If apparently it needs to be restored, it clearly needs to be 
documented, and actually asks
for an option. Could you -- Bruno and Stephane -- comment the report please?

Thanks.
Samuel