[R] 2 dimensional interpolation from matlab to R

[spencerg]

      Have you considered the "fda" package and the companion book, 
"Functional Data Analysis with R and Matlab" (Springer, 2009) by Ramsay, 
Hooker and Graves?  This will NOT help you directly with bathymetry = 
f(long, lat), but will help with b=f(x)+e AND with translations between 
Matlab and R. 


      To fit z=f(x,y), you may want "thin plate splines".  To find R 
capability for those, you might install the "sos" package and try the 
following (which requires Internet access): 


library(sos)
tps <- ???'thin plate splines'
summary(tps) # 38 help pages found in 9 packages
tsp # opens a web browser
     

      The "sos" package includes a vignette, which is essentially a copy 
of an article from the latest issue of The R Journal. 


      Hope this helps. 
      Spencer


karine heerah wrote:
> Hi everybody.
>
>  
>
> i have 2 datasets : one with a long grid a lat grid and a bathymetry grid
>
> the second one only has the long and lat coordinates.
>
> So i want to know the bathymetry associated to the second dataset. I thought it was a good idea to do an interpolation between the two datasets. I find a script doing that on matlab but i want to do it on R. Do you how to do it?
>
>  
>
> for ii = 1:length(seal_dive_depth07)
>     
>     seal_bathy_depth07(ii) = interp2(long,latg,A,seal_lon07(ii),seal_lat07(ii));
> end
>
>
>
> Karine HEERAH
>  
> Master 2 mention "océanographie et environnements marins", parcours océanique
>  
> 42 rue Salvador Allende 
> 92000 Nanterre
> 06.61.50.97.47
>
>
>
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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