Re: Number of arguments of a fcn handle

[Michael Goffioul]

On Sat, Oct 5, 2013 at 5:31 AM, marco Vassallo <address@hidden> wrote:

Hi all,
 In my DLD function I receive a function handle from the user and I need to check the number of arguments
(f = @(x, y) x*y has 2 arguments, f = @(x) sin (x) has 1 argument and so on)

 How can I do it?

This looks to me like a bad idea, but here are some clues anyway.

First, I believe this is only possible of the handle points to a user function. If it points to a DLD (or builtin function), there's no way to know how many arguments the function accepts. But in case, this is a user function, then you could use:

  ov.user_function_value()->parameter_list()

But then you would also need to take into account that the argument list can contain varargin, which hides the actual number of arguments accepted by a function.

Michael.