Having trouble subsetting data

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I'm trying to subset a data frame based on a factor. However even after subsetting R shows additional factors.

For instance in the iris dataset included in R I want to create a subset that only contains the Setosa species. However even after subsetting R shows that there are 3 factors when browsing through the data only shows Setosa. Why is this?

Thanks in advance

library(datasets)
data(iris)

sub = iris[iris$Species == "setosa"]

str(sub)

'data.frame':   50 obs. of  5 variables:
 $ Sepal.Length: num  5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...
 $ Sepal.Width : num  3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...
 $ Petal.Length: num  1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...
 $ Petal.Width : num  0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...
 $ Species     : Factor w/ 3 levels "setosa","versicolor",..: 1 1 1 1 1 1 1 1 1 1 ...

asked 1 min ago

canyon289

146