hello all, thank you for taking the time I have a matrix A that have column names (let say n columns), I want to reduce the matrix to have just a few of those column (p colums, this is trivial), but for the lines I want only the lines such that A(i,J) is part of a list (J is fixed and known)
I am sure it is very easy but I don't find it (I tryed which but it doesn't seem to work) Surely I could do a loop but I want to learn how to do things without time consuming loops. Thanks Colin -- View this message in context: http://n4.nabble.com/Accessing-values-of-a-matrix-tp1561932p1561932.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.
