This feels like inconsistent behavior. latticeParseFormula works the
way I anticipated for factor, but not for ordered. I want the
behavior I see with tmp2, but not with tmp. My next step is to use
the right.name to isolate the tmp2[,c("a","b")] columns.
tmp <- data.frame(y=(1:12)+.1,
a=factor(rep(1:3,4)),
b=ordered(rep(1:4, c(3,3,3,3))))
latticeParseFormula(as.formula(y ~ a + b), data=tmp)
tmp2 <- data.frame(y=(1:12)+.1,
a=factor(rep(1:3,4)),
b=factor(rep(1:4, c(3,3,3,3))))
latticeParseFormula(as.formula(y ~ a + b), data=tmp2)
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 1
minor 6.2
year 2003
month 01
day 10
language R
> tmp <- data.frame(y=(1:12)+.1,
+ a=factor(rep(1:3,4)),
+ b=ordered(rep(1:4, c(3,3,3,3))))
> latticeParseFormula(as.formula(y ~ a + b), data=tmp)
Error in a + b : non-numeric argument to binary operator
>
> tmp2 <- data.frame(y=(1:12)+.1,
+ a=factor(rep(1:3,4)),
+ b=factor(rep(1:4, c(3,3,3,3))))
> latticeParseFormula(as.formula(y ~ a + b), data=tmp2)
$left
[1] 1.1 2.1 3.1 4.1 5.1 6.1 7.1 8.1 9.1 10.1 11.1 12.1
$right
[1] NA NA NA NA NA NA NA NA NA NA NA NA
$condition
NULL
$left.name
[1] "y"
$right.name
[1] "a + b"
>
Rich
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