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2008 Dec 14
1
how to convert factors to numbers
...hen I use read.table, it treats all of the data as
"factors" and I do not know how to treat the data as numbers:
> spy<-read.table("c:\\StockData\\SPY.txt")
> attach(spy)
> names(spy)<-c("QDate","OpenP","HighP","LowP","CloseP","Vol","AdjP")
> spy[1,]
QDate OpenP HighP LowP CloseP Vol AdjP
1 12/14/2006, 141.86, 143.24, 141.84, 143.12, 64755200, 138.34
> ChangeFromOpen<-spy[1,5]-spy[1,2]
Warning message:
In Ops.factor(spy[1, 5], spy[1, 2]) : - not meaningful for fa...