I have question about ddply and subset. I have dataframe df like this : df <- read.table(textConnection( " id v_idn v_seed v_time v_pop v_rank v_perco 1 15 125648 0 150 1 15 2 17 125648 0 120 2 5 3 18 125648 0 100 3 6 4 52 125648 0 25 4 ...
I'm working with a large data frame called exp (file here) in R. In the interests of performance, it was suggested that I check out the idata.frame() function from plyr. But I think I'm using it wrong. My original call, slow but it works: df.median<-ddply(exp, .(groupname,starttime,fPhase,fCycle), n...
I am using plyr package in R to do the following: pick up a row from table A according to column A and column B find the row from table B having the same value in column A and column B copy column C from table B to table A I have made the progress bar to show the progress, but after it shows to 100% it seems to be still running, as I...