Hi everyone, I have a rollapply statement that applies a function, in steps, over a data matrix as follows:
#Code start testm<-rollapply(mat, 100, by=100, min, na.rm=F) #Code end This moves down matrix 'mat' and calculates the minimum value over a 100 row range, every 100 rows (i.e. no overlaps). NAs are not removed. I want to modify this statement somehow so that the rollapply() stops at a certain row in the matrix: i.e. it applies from the top, as instructed by the statement, but only to a certain row in the matrix. Can anyone suggest a way to do this using the additional arguments in the parentheses? One way would be to introduce an if statement, but is this the only way? Thanks, rcoder -- View this message in context: http://www.nabble.com/rollapply%28%29-to-portions-of-a-matrix-tp18761906p18761906.html Sent from the R help mailing list archive at Nabble.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.
