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.
In article <g219l2$k56$1@fred.mathworks.com>, Lu <lu_yu@nacm.com> wrote:
>Somehow I can't find my last thread regarding calculating
>second derivative. I still can't figure it out how I can
>compute approximate second derivatives for (x,y) data.
(As you are using the Mathworks newsreader, you will probably have
to manually paste that together into a single URL.)
--
"They called it golf because all the other four letter words
were taken." -- Walter Hagen
"Lu " <lu_yu@nacm.com> wrote in message <g219l2$k56
$1@fred.mathworks.com>...
> Hi,
>
> Somehow I can't find my last thread regarding calculating
> second derivative. I still can't figure it out how I can
> compute approximate second derivatives for (x,y) data.
>
> Thank you!
-------
It's also at:
"Lu " <lu_yu@nacm.com> wrote in message <g219l2$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
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