[Scilab-users] exists yields double

[Stéphane Mottelet]

Hi,

I completely agree with Samuel !

S.

Le 09/02/2021 à 12:27, Samuel Gougeon a écrit :
> Hello Federico,
>
> Le 10/10/2019 à 06:33, Federico Miyara a écrit :
>>
>> Dear all,
>>
>> I wonder why the function "exists" yields 1 or 0 as doubles, instead 
>> of boolean. I know there is little distinction between booleans and 
>> {0, 1} and can be easily converted back and forth. I also know that 
>> Scilab is not meant to be a strongly typed language. But wouldn't it 
>> make more sense that this kind of funtion yielded a boolean result?
>>
>> It challenges reason the fact that "isreal", for instance, yields a 
>> boolean and "exists" yields a double.
>
>
> Please use isdef() instead.
>
> exists() is a pure duplicate of isdef(), except for the output type.
> Converting its output into a boolean was asked 9 years ago as bug 
> 10892 
> <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/bugzilla.scilab.org/show_bug.cgi?id=10892>.
>
> We should hate introducing such duplicates, that just multiply issues 
> and confusion with strictly no added value.
> This is why its removal was proposed sortly after, as bug 11000 
> <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/bugzilla.scilab.org/show_bug.cgi?id=11000>.
>
> To me, there is no added value either to convert exist()'s output into 
> boolean, except if this function is actually removed, or at least 
> masked, i.e. kept only for backcompatibility reason but undocumented.
>
> Best regards
>
> Samuel
>
>
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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

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