diff of order n around a point x0

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adam 2012-8-3

Hello,

I would like to calculate the derivative of order n of function f with respect to x aaround a point x0.

diff(f,x,x0,n) but doesn't work

Any help!!

Thank you in advance.

Adam

Wayne King 2012-8-3

Do you have the Symbolic Toolbox and an expression for your function?

syms t
x = cos(2*t);
y = diff(x,2)
subs(y,0) %evaluate the 2nd derivative at t=0

adam 2012-8-3

编辑：adam 2012-8-3

Hello, Thank you for your answer. Yes, I have the symbolic toolbox.

I would like make sum of diff(x) for exemple for order n going from 0 to 5. I tried:

{symsum(diff(x,n), n, 0, 5)}

it dipalys an error. Thank you in adavance. Good day, Aam

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