[Scilab-users] Strange list error

[Stefan Du Rietz]

On 2014-01-28 09:54, Adrien Vogt-Schilb wrote:
--------------------
> 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
>
Thank you Adrien, but I have had many looks at it ;-)

I still don't understand the difference between my variables args and 
isfast. They are both defined in the function.

args: input values of the function are assigned to the corresponding 
local variables of the function (local variables and scoping 5.)

isfast: local variables defined at level_N remain local at that level. 
(local variables and scoping 2.).

What am I missing? Am I just stupid?

Stefan