Dear all: This is one of those "should be easy" problems that I'm having great difficulty solving. I have a vector containing ID codes, and I need to generate a 3-column matrix that contains all possible combinations of three.
For example, my ID vector looks like this: A B C D E I need to generate a matrix that looks like this: A B C A B D A B E A C B A C D A C E A D B A D C A D E .... and so on. (Yes, this could yield some very large matrices!) It's totally fine, though less desirable, if the resulting matrix contains combinations with "duplicates," e.g., A A A, A A B, or whatever. Thoughts? I'm pretty much stumped here. Thanks in advance for any help you can offer. Best regards, Brandon ______________________________________________ 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.
