[R] information about a function
Holger Flick
hflick at gmail.com
Mon Jul 17 13:05:37 CEST 2006
Hi people,
I am new in this list and could not find a FAQ for it in particular,
furthermore I could not find my question answered in the official R
FAQ or docs.
I have simply something like this:
> f<-approxfun(data[,1],data[,2])
and f is:
> f
function (v)
.C("R_approx", as.double(x), as.double(y), as.integer(n), xout = as.double(v),
as.integer(length(v)), as.integer(method), as.double(yleft),
as.double(yright), as.double(f), NAOK = TRUE, PACKAGE = "base")$xout
<environment: 02106C24>
I also used "locPoly".
Both yield either a function or a data frame of values.
Is there a way to get a mathematical representation of the function,
e.g. a polynomial of any order? Something like
ax^3+bx^2+cx^1+d or similar if it is of degree 3?
Basically, I want to create functions of measured values.
Thanks in advance for any hints.
--
Holger
--
Holger
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