Prevent automatic conversion of single column to vector

Question

I have a data frame like this:
df = data.frame(a=1:3, b=2:4, c=3:5)

I am selecting columns from that data frame using something akin to:

Answer 1

Also without the comma, i.e. df[c(T,F,F)], returns a dataframe but it sounds like you have cases where the new dataframe can have one or more columns. So use the drop option abovee

Answer 2

This one is pretty simple. Append , drop = FALSE to your subsetting.

E.g.

df[, c(T, F, F), drop = FALSE]

Also works for matrices.