derivative of scalar

You mean in terms of numerical means? Ever heard of finite differences?
Like: f'(x)=(f(x+h)f(x))/h or central: f'(x)=(f(x+h)f(xh))/2h 
Thank you akOOma. Seems there is no direct code for the derivative of scalar. I will use this basic method. Happy New Year!

If you kow the analytical form of the function you may give an exact derivative. Otherwise you have to use numerical approximations.

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