data frame question
On 10/02/2008, joseph <jdsandjd at yahoo.com> wrote:
Hello I have 2 data frames df1 and df2. I would like to create a new data frame new_df which will contain only the common rows based on the first 2 columns (chrN and start). The column score in the new data frame should be replaced with a column containing the average score (average_score) from df1 and df2.
Try this: (avoiding underscores)
new.df <- merge(df1, df2, by=c('chrN','start'))
new.df$average.score <- apply(df3[,c('score.x','score.y')], 1, mean, na.rm=T)
As always, interested to see whether it can be done in one line...
Dr. Mark Wardle Specialist registrar, Neurology Cardiff, UK