R help - May 2010 - Cubic B-spline, how to numerically integrate?

(corrected version of previous posting)

I fit a GAM to turtle growth data following methods in Limpus & Chaloupka
1997 (http://www.int-res.com/articles/meps/149/m149p023.pdf).

I want to obtain figures similar to Fig 3 c & f in Limpus & Chaloupka
(1997), which according to the figure legend are "expected size-at-age
functions" obtained by numerically integrating "size-specific growth
rate
functions derived using cubic B-spline fit to GAM predicted values".

I was able to fit the cubic-B spline, but I do not know how to "numerically
integrate" it.

Can anybody help please?

Code and figures here:
https://docs.google.com/fileview?id=0B1cQ7z9xYFl2ZTZhMmMyMjAtYTA3Zi00N2QyLTkxNzMtOGYyMjdiOGU2ZWE4&hl=en

Thank you,
Claudia

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On May 14, 2010, at 11:41 AM, Claudia Penaloza wrote:
> (corrected version of previous posting)
>
> I fit a GAM to turtle growth data following methods in Limpus &  
> Chaloupka
> 1997 (http://www.int-res.com/articles/meps/149/m149p023.pdf).
>
> I want to obtain figures similar to Fig 3 c & f in Limpus &
Chaloupka
> (1997), which according to the figure legend are "expected size-at-age
> functions" obtained by numerically integrating "size-specific
growth
> rate
> functions derived using cubic B-spline fit to GAM predicted values".
>
> I was able to fit the cubic-B spline, but I do not know how to  
> "numerically
> integrate" it.
You need to give us the function and the appropriate limits of  
integration.
>
> Can anybody help please?
>
> Code and figures here:
>
https://docs.google.com/fileview?id=0B1cQ7z9xYFl2ZTZhMmMyMjAtYTA3Zi00N2QyLTkxNzMtOGYyMjdiOGU2ZWE4&hl=en
>
> Thank you,
> Claudia
-- 

David Winsemius, MD
West Hartford, CT