Dear All, I am new to R. I have a 2 column data frame with more than ten thousand rows. Something like below. I want to add up all duplicated items, e.g. the three "aa" add up together to get a single value gene=a, value=74. How can I do that?? Thanks for help ! gene value aa 20 bb 10 cc 9 aa 30 aa 24 dd 100 ee 55 .... ... Millions thanks. Best Regards, hon
WONG, Hon-Kit (Stephen) Cleary Lab, Dept of Pathology Stanford University ______________________________________________ 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.
