MATLAB: Creating a symbolic variable, then using it as a real variable

diff()syms

I need my program to calculate the derivative of a function, and as far as I understand that means I need to make a symbolic variable. How then can I continue to use that variable as a real vector?
This is what I have tried:
syms x
y = input('Please enter a valid function of x')
deriv = diff(y)
syms clear
x = 0:pi/30:pi;
plot(x,y)

Best Answer

syms x
y = input('Please enter a valid function of x: ')
deriv = diff(y)  % This will be symbolic
x = 0:pi/30:pi;  % Now x is a double.
y = matlabFunction(y)  % y is a function handle.
plot(x,y(x))
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