Undefined columns selected with a subset of data

Question

I have a data frame, str(data) , to show more about my data frame, the result is as follows:

 > str(data) 'data.frame': 153 obs. of 6 variables: $ Ozone : int 41 36 12 18 NA 28 23 19 8 NA ... $ Solar.R: int 190 118 149 313 NA NA 299 99 19 194 ... $ Wind : num 7.4 8 12.6 11.5 14.3 14.9 8.6 13.8 20.1 8.6 ... $ Temp : int 67 72 74 62 56 66 65 59 61 69 ... $ Month : int 5 5 5 5 5 5 5 5 5 5 ... $ Day : int 1 2 3 4 5 6 7 8 9 10 ... 

However, for example, when I want to multiply the number of Ozone above 14, I use the following code, which gives me an error:

 > data[data$Ozone > 14 ] 

Error in [.data.frame (data, data $ Ozone> 14): undefined selected columns

Answer 1

You need lines where this condition is true, so you need a comma:

 data[data$Ozone > 14, ]