Subset multiple rows with condition

Question

I have a .txt file read into a table called power with over 2 million observations of 9 variables. I am trying to subset power

Answer 1

Try:

> subpower = power[power$Date %in% c("01/02/2007", "02/02/2007") ,]
> subpower
        Date Val
1 01/02/2007  14
8 02/02/2007  28

(Using power data from @akrun's answer)

Moreover, your own code will work if you use proper name of subset: "subpower" instead of "powersub"!

> subpower <- subset(power, Date %in% c("01/02/2007", "02/02/2007"))
> subpower
        Date Val
1 01/02/2007  14
8 02/02/2007  28
>
> str(subpower)
'data.frame':   2 obs. of  2 variables:
 $ Date: chr  "01/02/2007" "02/02/2007"
 $ Val : int  14 28