Hello,
I would like to be able to update an existing column in a dataframe,
like this...
data$score[data$type=="1" & data$year=="2001"]<-data$score * 0.111
data$score[data$type=="1" & data$year=="2002"]<-data$score * 0.222
data$score[data$type=="1" & data$year=="2003"]<-data$score * 0.333
...but, if possible, using simpler code. I've got several dozen lines of
code like this (type 2, type3, etc. for the same years) so it would be
great if I could reduce each set of three lines of code to one line
Any help much appreciated, thanks!
Mark
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