Hello, Do you mean exactly any 2 columns. What if the value is equal in more than 2 columns?
> > I built a data frame "grid" (below) with 4 columns. I want to exclude > all rows that have equal values in ANY 2 columns. Here is how I am > doing it: > > index<-expand.grid(1:4,1:4,1:4,1:4) If a value is equal in 2 or more rows, i.e., duplicated, then the following should work, assuming index can be changed to a matrix for apply ... t3 <- index[apply(index, 1, function(x) all(!duplicated(x))),] ______________________________________________ [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.
