> I have an other problem, I have this vector signData with an alternation of > 1 and -1 that corrispond to the duration of two different percepts. I > extracted the durations like this: > > signData<- scan("dataTR10.txt") > dur<-rle(signData)$length
I think that last line should be dur<-rle(signData)$lengths > Now I would like to extract only the positive duration, e.g. > > signData <- c(1,1,1,1,-1,-1,-1,1,1,-1,-1) > posduration <- c(4,2) If you know that the first element of signData will always be 1, then you can simply extract the first, third, fifth etc values from signdata, like so: posduration <- dur[c(TRUE, FALSE)] Otherwise you need to test to see if you are extracting odd or even elements. if(signData[1]==1) { index <- c(TRUE, FALSE) } else { index <- c(FALSE, TRUE) } posduration <- dur[index] Regards, Richie. Mathematical Sciences Unit HSL ------------------------------------------------------------------------ ATTENTION: This message contains privileged and confidential inform...{{dropped:20}} ______________________________________________ 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.