Re: How to modify structure fields inside functions

[PhilipNienhuis]

ponipei wrote
> 
> Hi everybody,
> 
> I need your help to understand how to modify a structure field inside a
> function. For example:
> 
>>> a.b=3
> a =
> {
>   b =  3
> }
> 
>>> function modify (s)
>> setfield(s,'b',5)
>> endfunction
> 
>>> modify(a)
> ans =
> {
>   b =  5
> }
> 
>>> a.b
> ans =  3
> 
> 

You trapped into forgetting the assignment. If you don't assign a function
result to a variable, Octave assigns it to dummy variable "ans".

You should do:

a = modify (a)

IOW, Octave's language doesn't have "call by reference".

Philip

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