Use factors with specified levels.
> lev <- letters[1:4]
> table(factor(letters[1:4], levels = lev),
factor(letters[c(1:3,3)], levels = lev))
a b c d
a 1 0 0 0
b 0 1 0 0
c 0 0 1 0
d 0 0 1 0
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Manuel Morales
Sent: Sunday, 3 December 2006 11:27 AM
To: r-help@stat.math.ethz.ch
Subject: [R] Force "square" crosstabulation
Hello list members,
I'm looking for a way to force the results of a crosstabulation to be
square - that is, to include 0 values.
For example:
table(letters[1:4],letters[c(1:3,3)])
yields:
a b c
a 1 0 0
b 0 1 0
c 0 0 1
d 0 0 1
I would like to return:
a b c d
a 1 0 0 0
b 0 1 0 0
c 0 0 1 0
d 0 0 1 0
Any suggestions?
Thanks!
--
Manuel A. Morales
http://mutualism.williams.edu
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
