On 4 Aug 2006 at 10:23, Lorenzo Isella wrote:
Date sent: Fri, 4 Aug 2006 10:23:06 +0200
From: "Lorenzo Isella" <[EMAIL PROTECTED]>
To: r-help@stat.math.ethz.ch
Subject: [R] Integration and Loop in R
> Dear All,
> I have seldom needed to use loops in R, but now I need to code a loop
> with a stride different from one. In the R manual I downloaded I have
> the example: > xc <- split(x, ind) > yc <- split(y, ind) > for (i in
> 1:length(yc)) {
> plot(xc[[i]], yc[[i]]);
> abline(lsfit(xc[[i]], yc[[i]]))
> }
> but in my case I'd like to add a condition so that i varies by 4 from
You can make i vary as you wish.
e.g.
steps <- seq(1,40,4)
for (i in steps) ......
> one go to the following one. I cannot figure out the right syntax, can
> anyone help here? Another thing (which could possibly solve my
> problem): I had a look at integrate command in R. It seems to require
> an object defined as a function to carry out the integration. What if
> I simply have a list of data values? How can I coerce them into a
> function recognized by R? Furthermore, are there R routines to carry
> out the integration on a non-equally spaced 1D grid? Best Regards
Try to look at splinefun or approxfun.
HTH
Petr
>
> Lorenzo
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html and provide commented,
> minimal, self-contained, reproducible code.
Petr Pikal
[EMAIL PROTECTED]
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