[Scilab-users] Getting the variable name used for a function input argument

[Jens Simon Strom]

Hi,
Thanks for all the responses and sorry for not beeing able to answer 
before now.

The background of my question was to write a function for formatted 
output of complex variables in polar form with

mprintf like

function printc(c)

which returns the name of c on calling level, |c|, and the angle.

I understand now that I have to write e. g.

function printc(c,cname)

where cname is the wanted string. This can even give some additional 
freedeom in modifying the output name.

Regards
Jens


Am 24.11.2021 um 09:51 schrieb Stéphane Mottelet:
>
> Hi,
>
> Le 24/11/2021 à 01:42, Federico Miyara a écrit :
>>
>> I'm not completely sure, but I think this is not possible since what 
>> is passed to the function isn't a variable but the value contained in 
>> the variable.
> No. Internally, input arguments are passed as references to the true 
> object. There is no copy unless an input argument is modified in the 
> function (in that case a copy with local scope only).
>> The name is lost in the process.
> Yes, before the first line of the function body the original object 
> has the name of the argument, although both names refer to the same 
> object.
>>
>> An alternative way (but I don't know if this would be acceptable for 
>> you) is that the function had as its argument a variable name (hence, 
>> a string), so your x would be "xNum", instead of 123. Then you could 
>> use evstr() to get the value of the variable to proceed with the 
>> processing.
>
> I think that we are in the presence of an XY problem 
> (https://xyproblem.info/) and that Jens should explain the whole story.
>
> S.
>
>>
>> Regards,
>>
>> Federico Miyara
>>
>>
>> On 23/11/2021 17:18, Jens Simon Strom wrote:
>>>
>>> Hi Scilab friends,
>>> Given a numeric variable like xNum as an input argument of a 
>>> function call, how can I produce the variable name string "xNum" 
>>> within the function?
>>>
>>> Example:
>>>
>>> function [name,y]=foo(x)
>>>    name=???
>>>    y=x^2
>>> endfunction
>>>
>>> xNum=123.
>>> [name,y]=foo(xNum)
>>> The result for name should be the string "xNum"
>>>
>>> Regards
>>> Jens
>>> _______________________________________________
>>> users mailing list
>>> users at lists.scilab.org
>>> http://lists.scilab.org/mailman/listinfo/users
>>>
>>>
>>
>>
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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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