>>>>> "t" == thierrydb <[EMAIL PROTECTED]>
>>>>> on Fri, 14 Dec 2007 07:19:56 -0800 (PST) writes:
t> Hello,
t> I'm new to R. If I have a set of 10 points (X(i), Y(i)), is there an
elegant
t> way to build a function y=f(x) that would be build out of the consecutive
t> segments of X(j),Y(j) points (with X(j) sorted)?
Yes.
approxfun() !
E.g.
set.seed(1); x <- runif(10); y <- 3*x + rnorm(10)/10; plot(x,y)
myF <- approxfun(x,y)
myF(0.1)
## [1] 0.3734227
and then
plot(myF, add=TRUE, col=2) ## using plot() method for functions
or simpler to understand:
xx <- seq(0,1, length=100)
lines(xx, myF(xx), col=2)
t> Thank you very much
t> TDB
you're welcome.
Martin Maechler, ETH Zurich
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