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qca
2002 Sep 30
4
2 plots sharing axis / combining factors
...factor variables in a single factor variable
which is the combination of the other 2.
Example:
lith: a factor 2 levels "ca", "ma"
sp: a factor with 2 levels, "ph", "qi"
and I'd like to obtain:
splith: a factor with 4 levels: phma, phca, qima, qica
on way is by using ifelse:
splith <- as.factor(ifelse(sp=="ph", ifelse(lith=="ma", "phma", "phca"),
ifelse(lith=="ma", "qima", "qica")))
which works fine, but I've got the feeling that it can be done in a more
efficient...