how i can have dimension input of a defined function like f ?

i have a code that input of its a handle function like f, in duration of this code i need to number of input this function for example f is: f=@(x,y)(x+y)

Answer 1

[Azzi Abdelmalek]

f=@(x,y)(x+y)
s=func2str(f);
a=regexp(s,'(?<=@\()[\w,]+(?=\))','match')
out=numel(cell2mat(regexp(a,'\w+')))

[xosro]

thank you so much mr Azzi Abdelmalek.

Answer 2

[Walter Roberson]

f = @(x,y)(x+y)
out = nargin(f)