[R] Possible to use array of spline functions for storing data?

[Dieter Menne]

David Winsemius wrote:
> 
> Dear listeRs;
> 
> I am hoping to provide myself the ability to interpolate mortality  
> estimates within intervals for a range of conditions and ages. I have  
> four mortality tables derived from the Society of Actuaries 2001 VBT  
> tables that contains interval mortality rates by starting age and year  
> of duration. I would like to flexibly interpolate using a large set  
> (~4MM) of ages and conditions as input to small number (~300) of  
> functions, but my toy implementations puzzle me when I examine them,  
> and I cannot seem to store them properly. Say you start with a vector  
> of qx's:
> ....
> 

How about using the polynomial representation given be polySpline in package
splines? It a slightly decorated list of knots and coefficients that could
be stored in a database.

Dieter

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