In data OME in MASS I would like to extract the first 5 observations per subject (=ID). So I do library(MASS) OMEsub <- split(OME, OME$ID) OMEsub <- lapply(OMEsub,function(x)x[1:5,]) unsplit(OMEsub, OME$ID)
- which results in [[1]] [1] 1 1 1 1 1 [[2]] [1] 30 30 30 30 30 [[3]] [1] low low low low low Levels: N/A high low [[4]] [1] 35 35 40 40 45 [[5]] [1] coherent incoherent coherent incoherent coherent Levels: coherent incoherent [[6]] [1] 1 4 0 1 2 ............ [[1094]] [1] 4 5 5 5 2 [[1095]] [1] 100 100 100 100 100 [[1096]] [1] 18 18 18 18 18 [[1097]] [1] N/A N/A N/A N/A N/A Levels: N/A high low There were 50 or more warnings (use warnings() to see the first 50) warnings() Warning messages: 1: number of items to replace is not a multiple of replacement length 2: number of items to replace is not a multiple of replacement length 3: number of items to replace is not a multiple of replacement length .... According to documentation unsplit is the reverse of split, but I must be missing a point somewhere... Can anyone help? Thanks in advance. Søren ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
