[Scilab-users] Strange list error

[Adrien Vogt-Schilb]

On 28/01/2014 09:41, Stefan Du Rietz wrote:
> On 2014-01-27 22:43, Serge Steer wrote:
> --------------------
>> Le 27/01/2014 19:05, Stefan Du Rietz a écrit :
>>> Hello Paul,
>>> after trying like a maniac ;-) I finally managed to reproduce it!
>>>
>>> The error shows up only when you run the command from the command
>>> window after a pause in the attached function testlisterror.sci.
>>>
>>> -->testlisterror("pnonfast","nonfast")
>>> -1->args(1) = null()
>>> args(1) = null()
>>>                  !--error 44
>>> Wrong argument #2.
>>>
>>> Without the pause it works OK.
>>>
>>> Regards
>>> Stefan
>> Under pause, you cannot modify a variable which is defined in the
>> calling context
>> so in such a context args is not a list as you expect but an empty
>> array which is implicitely created
>>
>> To make it work
>> you must do
>> -1-> args; //makes a local copy of args
>> -1->args(1) = null()
>>
>> Serge
>
> What do you mean by "defined in the calling context"?
> I can modify this:
>
> -1->isfast
>  isfast  =
>     0.    0.
> -1->isfast(1) = 1
>  isfast  =
>     1.    0.
>
> Stefan
>
>

Stefan, you may want to have a look at 
http://wiki.scilab.org/howto/global%20and%20local%20variables
This page explains what Serge means i believe.

Adrien





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-- 
Adrien Vogt-Schilb
PhD Student (Cired)