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Topic: second derivative
Replies: 5   Last Post: Feb 12, 2013 2:16 PM

 Messages: [ Previous | Next ]
 aasim Azooz Posts: 62 Registered: 4/22/08
Re: second derivative
Posted: Jun 3, 2008 4:04 PM

"Lu " <lu_yu@nacm.com> wrote in message <g219l2\$k56
\$1@fred.mathworks.com>...
> Hi,
>
> Somehow I can't find my last thread regarding calculating
> second derivative. I still can't figure it out how I can
> compute approximate second derivatives for (x,y) data.
>
> Thank you!

if y=f(x) then the first derivative is
y1=diff(y)./diff(x)
The second derivative is
y2=diff(y1)./diff(x)
don't forget that the size of y1 is less than the size of y
by one and the size of y2 is less than the size of y by two

Aasim Azooz

Date Subject Author
6/2/08 Lu Yu
6/2/08 Walter Roberson
6/2/08 Roger Stafford
6/3/08 aasim Azooz
2/12/13 winnie
2/12/13 Derek Goring