I have two dataframes, the first column of each dataframe is a unique id number (the rest of the columns are data variables). I would like to figure out how many times each id number appears in each dataframe.
So far I can use: length( match (dataframeA$unique.id[1], dataframeB$unique.id) ) but this only works on each row of dataframe A one-at-a-time. I would like to do this for all of the rows in dataframe A, and then put the results in a new variable: dataframeA$count I'm new to R, so please be patient with me! Sorry if this question has already been answered, my search of the archives only brought up one relevant post, and I didn't understand the answer to it.... http://www.nabble.com/match-to20799206.html#a20799206 thx -- View this message in context: http://www.nabble.com/matching-each-row-tp24393051p24393051.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
