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 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
Lorenzo ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.