[R] akima

Thomas Petzoldt petzoldt at rcs.urz.tu-dresden.de
Tue Dec 7 07:55:49 CET 2004

Erin Hodgess wrote:
> There is a contributed package called "Akima" which
> has the akima function.
> R Version 2.0.1
> Windows
> The akima is from October 2004, so it is up to date.

Yes I know. But, unfortunately package akima contains a different 
algorithm meant for "bivariate interpolation and smooth surface 
fitting", but what I wanted was an interpolation algorithm for 
univariate functions similar to splines, but which is according to the 
author "closer to a manually drawn curve than those drawn by other 
mathematical methods". (AFAIK the only disadvantage is, that the second 
derivative is not continuous.)

The FORTRAN algorithm is available on the ACM portal and in several 
other online resources and I wonder, why it is not yet available in one 
of the numerous contributed packages. If this is not the case I should 
write an R interface to it, but for a single function it would be nice 
not to write a new package, but to include it somewhere.

Thomas P.

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