newbie: check if variable is a function handle

[Alex Colunar]

Hello,

I would like to know how to determine whether a given variable holds a
function handle. 

I have noticed that Octave contains plethora of functions for determining if
a variable is of given type, but I cannot find one for function handles.

What I want to do in general is to write a function taking as an argument
another scalar function: as a string, a function handle, or a vector with
function arguments and values in given points (depending on user's
convenience). If the supplied variable is none of above, I want the function
to display error.


Best Regards
Alex
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