Why is my function not working?

I wrote this in a coding window:

function z = z(x)

z = (v^(x/2)-v^(-x/2))/(t^(x/2)-t^(-x/2));

end

then I saved it, went to the command prompt and typed z(3). I want my result to be:

(v^(3/2)-v^(-3/2))/(t^(3/2)-t^(-3/2))

But instead i get:

Error in z (line 2)

z = (v^(x/2)-v^(-x/2))/(t^(x/2)-t^(-x/2));

What is going wrong here? Thanks!

Answer 1

[madhan ravi]

 syms v t % in the first line of function

Answer 2

[Ameer Hamza]

Because you haven't defined the values of v and t inside the function. Change to something like this

function z = z(x)
v = 1;
t = 2;
z = (v^(x/2)-v^(-x/2))/(t^(x/2)-t^(-x/2));
end