Converting factors back to numbers in R
The html help file for factors gives To ?revert? a factor f to its original numeric values, as.numeric(levels(f))[f] is recommended and slightly more efficient than as.numeric(as.character(f)). John C. Frain. Economics Department Trinity College Dublin Dublin 2 www.tcd.ie/Economics/staff/frainj/home.html mailto:frainj at tcd.ie Quoting ????? ??????? <volchik2000 at list.ru>:
Hi everybody,
i've spent a lot of time trying to fix the following problem:
i'm trying to load into R several dataframes with stocks data through:
dat<-lapply(1:Number.of.contracts,function(x) {
print(Names[x])
read.csv(paste(WorkingDirectory,Names[x],
'_',TimeFrame,'.csv',sep=''),as.is=T,header=T,row.names=1,na.strings=c("#NA",""))
}) Because the header are times in the format "HH:MM" R converts them to strings, changing in the way. It's now a problem, i can fix it using sub (gsub) functions. Problem is that R converts prices to factors as well even though i have option as.is=T set, and then it almost impossible to convert them back to double preserving the row.names (these are dates) and column names (times), probably because of the structure i store them in (list of dataframes). I suspect there is an easy way to solve this problem, but couldn't figure it out :( Thanks
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