Subseting by more than one factor...

Douglas Bates · 2003-06-19T22:54:21Z

Fernando Henrique Ferraz Pereira da Rosa writes: > Is it possible in R to subset a dataframe by more than one factor, all at > once? > For instance, I have the dataframe: > >data > p1 p2 p3 p4 p5 p6 p7 p8 p9 p10 pred > 1 0 1 0 0 0 0 0 0 0 0 0.5862069 > 4 0 0 0 0 0 0 0 0 0 1 0.5862069 > 5 0 0 0 0 0 0 1 0 0 0 0.5862069 > 6 0 0 0 0 0 0 0 1 0 0 0.5862069 > 7 0 0 1 0 0 0 0 0 0 0 0.58620

Douglas Bates

Thu, Jun 19, 2003 3:54 PM

Fernando Henrique Ferraz Pereira da Rosa <mentus at gmx.de> writes:

As Sundar pointed out it is the second form that you want.  When
intersecting conditions in subset() use &, not &&.

The way that you pasted the output in your message the column names
did not align with the columns.  I changed this in the part that I
quoted above.  This shows that you chose the wrong example, I think,
because that intersection is empty.  Try 

 subset(data, p2 == 1 & p3 == 1)

instead.

Subseting by more than one factor...

Thread (3 messages)