Hi, I have a matrix (pwdiff in the example below) with ~480000 rows and 780 columns. For each row, I want to get the percentage of columns that have an absolute value above a certain threshold "t". I then want to allocate that percentage to matrix 'perc' in the corresponding row. Below is my attempt at doing this, but it does not work: I get 'replacement has length zero'. Any help would be much appreciated!!
perc<-matrix(c(1:nrow(pwdiff))) for (x in 1:nrow(pwdiff)) perc[x]<-(((ncol(pwdiff[,abs(pwdiff[x,]>=t)]))/ncol(pwdiff))*100) I should add that my data has NAs in some rows and not others (but I do not want to just ignore rows that have NAs) Thanks! Paul -- View this message in context: http://r.789695.n4.nabble.com/counting-columns-that-fulfill-specific-criteria-tp3622265p3622265.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ [email protected] 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.
