[Scilab-users] {EXT} strange behaviof of function isreal

[Stéphane Mottelet]

Le 13/11/2019 à 11:09, Dang Ngoc Chan, Christophe a écrit :

> Hello,
>
>> De : De la part de Jean-Philippe Grivet
>> Envoyé : mercredi 13 novembre 2019 10:50
>>
>> --> z = [1,2,3*%i]
>>    z  =
>>      1.   2.   3.i
>> --> isreal(z(1))
>>    ans  =
>>     F
>> What did I miss ? Rhank you for your help.
> https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/help.scilab.org/docs/6.0.2/en_US/brackets.html
>
> "In some limits, brackets may be applied on a set of data having different but compatible types. In this case, some data are converted into the dominating type available in the set. The main conversion rules are the following:
> [...]
> 3. The result becomes complex-encoded as soon as a complex-encoded component -- value, polynomial, or rational -- is met in the list (even with a null imaginary part)"

This non-intuitive behavior will be fixed as soon as the patch

https://codereview.scilab.org/#/c/21090/

will be merged !

S.

>
> Regards
>
> --
> Christophe Dang Ngoc Chan
> Mechanical calculation engineer
>
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet