Menu
I have a data frame, str(data) to show more about my data frame the result is the following:
> 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 subset the amounts 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 columns selected
416
R ProgrammingServer Side ProgrammingProgramming. The error “undefined columns selected when subsetting data frame” means that R does not understand the column that you want to use while subsetting the data frame. Generally, this happens when we forget to use comma while subsetting with single square brackets.
1 Adding new columns. You can add new columns to a dataframe using the $ and assignment <- operators. To do this, just use the df$name notation and assign a new vector of data to it. As you can see, survey has a new column with the name sex with the values we specified earlier.
You want rows where that condition is true so you need a comma:
data[data$Ozone > 14, ] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
