How do you substitute multiple variable in to an equation??

I have a simple case where

syms x y;

f= x+y;

how shoud I substitute x and y seperately??

just like subs function: subs(f, 1) which only substitutes y in this case

Answer 1

[Walter Roberson]

subs(f, variable_name, new_value)

Answer 2

[Star Strider]

Symbolic functions are possible beginning with R2012a (if I remember correctly).

This should do what you want:

syms x y 
f(x,y) = x+y;

A numeric equivalent would be:

f = @(x,y) x + y;