Re: Expected behavior for variables which shadow function names

[Thorsten Liebig]

Am 08.03.2013 10:13, schrieb Julien Bect:
> On 07/03/2013 20:13, John W. Eaton wrote:
>> Some things to test:
>>
>>   function f (jet)
>>     jet
>>   end
>
> Here is what I think the answer should be (based on my own Matlab user 
> experience) :
>
> f() --> not enough input arguments
> f(0) --> 0
> f(1) --> 1
>
> The fact that the symbol "jet" refers to a variable is determined IMO when 
> Matlab first parses the function. Therefore, even if nargin == 0, jet is
> assumed to refer to a variable in the context of this function.
>

I can confirm that with Matlab R2011a:

??? Input argument "jet" is undefined.

Error in ==> f at 2
    jet

>
>> function f (jet)
>>     if (nargin == 0)
>>       jet
>>     elseif (nargin == 1)
>>       x = jet
>>     end
>>   end
>
> Same thing IMO, for the same reasons.

Yes.

>
>
>> function f ()
>>     jet = 1;
>>     clear jet
>>     jet
>>   end
>
> I think this should generate an error : when the function is parsed, Matlab 
> determines that "jet" refers to a local variable in this function.
>
> Therefore, the third line of code should generate an error since jet has been 
> cleared.

Yes, the error is:

??? Reference to a cleared variable jet.

Error in ==> f at 4
    jet

>
> Best regards,
>
> Julien.
>
>

regards
Thorsten