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translation of the matlab PPVAL function

2 messages · pecqueur@esbs.u-strasbg.fr, Martin Maechler

pecqueur@esbs.u-strasbg.fr
# 
Hello,

I am trying to translate a matlab program into R, and I have some problems
to find out how to translate the PPVAL function.
I know that ppval(pp,xx) returns the value at the points xx of the
piecewise polynomial contained in pp( constructed by spline), but I don't
know how to do the same thing in R.

Thanks for you help


Delphine
1 day later
Martin Maechler
# 
Probably   ?spline  and the builtin  spline() function is
already sufficient for you.

If you need more, use the (standard R) 'splines' package:

library(splines)
library(help = splines)
pecqueur> Hello,
    pecqueur> I am trying to translate a matlab program into R, and I have some problems
    pecqueur> to find out how to translate the PPVAL function.
    pecqueur> I know that ppval(pp,xx) returns the value at the points xx of the
    pecqueur> piecewise polynomial contained in pp( constructed by spline), but I don't
    pecqueur> know how to do the same thing in R.

    pecqueur> Thanks for you help

    pecqueur> Delphine