Strange issue with 'subset'
r, subset
Solution
Subset is a function, so you should use `subset(DF, v1 < 0)` instead of the square brackets.
Square brackets are used for subsetting dataframes or matrices directly. `subset[DF, v1 < 0]` is trying to subset the `subset` function by looking for the variable `v1` within the scope of the `subset` object. The object `subset` is a function, so it can't find the `v1` object.
Problem
I have a strange issue with `subset`: it doesn't recognize the variables in my dataframe. For example, if I want a summary of the variable `v1` in the dataframe `DF`, I get: ``` summary(DF$v1) Min. 1st Qu. Median Mean 3rd Qu. Max -123.00 4.00 14.00 84.62 49.00 13140.00 ``` Now, this variable should always be non-negative, so I want to inspect the negative values by subsetting the dataframe `DF` into the dataframe `PROBS`. But if I try this: ``` PROB <- subset[DF, v1 < 0] ``` I get: ``` Error: object "v1" not found ``` I am positive that I am not misspelling this variable name. I have tried with other variables in this dataframe, but it keeps throwing this error at me. Does anyone have any idea about the reason for such a strange behaviour? I have never had any problem with the `subset` function! Thanks.