[R] First and second derivatives of raw observations

[Spencer Graves]

        There is a strong argument for fitting something like splines 
and then differentiating the spline fit.


       I trust you won't object to my immodest recommendation of the 
"fda" package and book by Ramsay, Hooker and Graves (2009) Functional 
Data Analysis with R and Matlab (Springer).  The "fda" package includes 
scripts to work all but one of the 76 examples in the book.


       Hope this helps.
       Spencer Graves


On 8/30/2010 4:13 PM, Duncan Murdoch wrote:
> On 30/08/2010 6:40 PM, mtorabi at math.carleton.ca wrote:
>> Dear all,
>>
>> I was asked to send the following question:
>>
>> We have some (raw) observations and would like to get the first and 
>> second
>> derivatives in R. Any comment would be appreciated.
>
> Fit a model, and take derivatives of the fit.  Which model?  Depends 
> on the context.
>
> Duncan Murdoch
>
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-- 
Spencer Graves, PE, PhD
President and Chief Operating Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph:  408-655-4567