Relative noob here, I have a data.frame and simply want to add an explicit column of names in column 1 of the form
"trial_number01" for row 1, "trial_number02" for row 2 .... etc.  It is simply for visual purposes and to explain data to others.  I've tried
Using row.names and other but still no luck, am sure it has been covered but I can't find it, can you please point me in the right direction?

Thanks

Jim


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Dr. Jim Maas
University of East Anglia
Norwich, UK


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