unable to perform calculations using r data.table package

Question

I have a huge data frame, last 30 rows are below:

libary(data.table)

dput(p)

structure(list(DATE = structure(c(1367516015,          


        

Answer 1

I did this:

sapply(p, class)

and noticed that one of my columns was integer. Then I did this:

x<-x[,RELATIVE_PERCENT:=ifelse(ENT_PCT>100, ((USED_CORES/ENT)*100), as.numeric(USR_SYS_CPU_PCT)), by= c("DATE", "LPAR")]

and it is money