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...and merging it to a variable which is the first column extracted. Firstly thsi seems very convoluted, secondly it gives a seg fault (I'm guessing because memory hasn't been allocated for the second column on the creation of teh first variable). So any ideas about the easy way of doing the matsh so I can then just use plot(z, .....) as before? Cheers in advance, Kenny -- View this message in context: http://www.nabble.com/Squaring-one-column-of-data-tp23997104p23997104.html Sent from the R help mailing list archive at Nabble.com.