Probably a stupid question, but I don't seem to be able to find the answer I'm looking for from any of the R literature. Basically I have a matrix with several thousand rows and 20 columns(weather stations) of wind direction data.
I am wanting to extract a matrix which contains data for all columns conditional on column 20 having a value of _either_ less than 45 or greater than 315. (ie I want to extract a matrix which contains wind direction data for all columns {weather stations} when there is a prevailing northerly wind for one of the stations). I have tried a few different methods of doing this, none with any success, can anyone please advise? Thanks in advance! ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help