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

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SYED
SYED 2024-4-6
编辑： John D'Errico 2024-4-6
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

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John D'Errico
John D'Errico 2024-4-6
编辑：John D'Errico 2024-4-6
Ran in:
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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