How can I make function value symbolic?

function t = turev(x,y)
.
.
.
end
x = x^2+y^2, y = 1 
How can I make the function "x ^ 2 + y ^ 2" symbolic when I enter the values?

Answer 1

[John D'Errico]

If either of x or y are already symbolic, then any computations done on them will also be symbolic.

You can create a symbolic constant or variable using sym or syms, depending on exactly how you want to do it.

help sym

Answer 2

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/363947-warning-support-of-strings-that-are-not-valid-variable-names-or-define-a-number-will-be-removed-in

Please do not ask the same question multiple times. The hamsters are paddling as fast as they can.