On 2/07/2009, at 9:53 AM, Thomas Mang wrote:
Hi,
I am looking for a function which can convert a single factor (a
vector), or a list of multiple factors, into the indicator (dummy)
matrix with 0/1 entries (or other contrasting schemes). I could
cook it
myself, but I am actually sure this thing already exists - but forgot
the name and package. IIRC it was clearly different from model.matrix,
because it had a nicer, more straightforward interface [I know how to
use model.matrix. I just can't figure out the other function any
more].
It seems to me that
m <- model.matrix(~x)
(where x is your factor) is pretty straightforward. How much simpler
can it get? The power of the formula concept is working for you here;
it would be hard to do without it.
cheers,
Rolf Turner
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