Re: Function handles, feval's docstring

[Ben Abbott]

On Aug 7, 2011, at 10:26 PM, Jordi Gutiérrez Hermoso wrote:

> feval seems to have an outdated docstring that says Octave doesn't
> have function pointers, probably from the days when Octave didn't have
> function handles. Would it make sense to change this to say that feval
> is most useful when you have function names as strings instead of
> handles?
> 
> Furthermore, is there a function like "isfunction" or something to
> test if a variable is a function handle? If not, can I make one? What
> should it be called?
> 
> Thanks,
> - Jordi G. H.


A simple implementation would be ...

        isfunction = @(h) strcmp (class (h), 'function_handle')

There's something very GNU about that ;-)

>> isfunction (isfunction)
ans =  1

Regarding the name of the function, most of the other "is" functions use the 
corresponding class names. So I think the appropriate options are "isfunction" 
or "isfunction_handle"

Ben