How to insert data in taylor series?

I want to know e(error).

But, I can not insert x and y value into Taylor series.

This is my code.

syms x y z
f = x*y^2;
U=taylor(f,[x,y],[6,11],'order',2');
 x = input('What is your x -axis value ?');
 y = input('What is your y -axis value ?');
z=x*y^2
e=(U-z)/U*100;

How to insert x and y value into U equation that is result of taylor series?

I want to calculate error at x =5 and y = 10.

Answer 1

[Walter Roberson]

subs(e, {x, y}, {5, 10})

You would probably want to double() the result.