Hello,
It looks to me as if the ! logical operator cannot be called when
subsetting a data.frame. In the example below, the value column has two
factor levels (but my typical datasets have more), and what I am trying
to do is to exclude all lines for which the value is different from
A. I
Sébastien pomchip at free.fr writes:
Can you please point to me my syntax mistake or indicate a method to get
this type of data.frame subset ?
Thank you in advance
ID value
1 1 1.2
2 2 1.2
3 3 1.2
4 4 1.2
5 5 A
6 6 A
7 7 A
8 8 A
