Hi Alex, This ought to do what you are after. For searching, I found the most helpful thing to be thinking about what I was really after---this helps with generating several key words to look for, which is more likely to turn up results. I also included some functions/packages to help with R specific searching below.
Cheers, Josh ####################### ## pseudo-random data with mean = 0 x <- rnorm(20) ## Logical, vectorized test so it compares each element ## of x and determines whether it is greater than 2 or not ## returns a vector of TRUE/FALSE x > 2 ## When indexing in R, if you pass a TRUE/FALSE vector of equal ## length, it will select TRUE elements and exclude the FALSE ## so your solution is: x[x > 2] ## or if you just want the indices, not the actual values which(x > 2) ## for documentation see ?Comparison #logical comparison/test ?logical # TRUE/FALSE class ?which # which function ?"[" # indexing ############################################ ## You can use this built in search function RSiteSearch("your key word(s)") ## If you think you almost know the name, apropos looks up objects ## in R that include your search string apropos("find") ## There is a package to help with searching: install.packages("sos") library(sos) findFn("words for desired function") On Wed, Nov 17, 2010 at 6:35 AM, Alaios <ala...@yahoo.com> wrote: > Hello everyone. > In matlab (again) there is a fucntion find that returns you the indexes > where the condition in find was met. I want the same functionality in R i.e > find(Mydata>2) to return all the indexes where the condition is met. Do you > know something like that? > > Also when I try to search in google using for example the word R inside the > search lemma I get very few results as the R confuses the search engine. When > I was looking something in matlab ofcourse it was easier to get results as > the search engine performs better. > What are your tricks when you want to find some function that provides some > functionality? > > I would like to thank you for your help > Regards > Alex > > > > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org 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. > > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ ______________________________________________ R-help@r-project.org 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.