code for check wether the given differential function is function g(x) or g(x,y) in matlab

how to check wether the given differential function is function g(x) or g(x,y) in matlab
maybe i am doing mistake
clear
clc
syms x y
a=input('f(x,y)=')
f=inline(a,'x','y')
g=inline(diff(f(x,y),x))
if g==f(x)
k=g(1)
elseif g==f(x,y)
k=(1,2)
end

 采纳的回答

Easy. For example...
syms x y
expr1 = 2*x;
expr2 = x + x*y;
Now use symvar.
symvar(expr1)
ans = 
x
numel(symvar(expr1))
ans = 1
symvar(expr2)
ans = 
numel(symvar(expr2))
ans = 2
So expr2 is a function of two symbolic variables.

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