On 31/10/2007 4:33 PM, Michael Kubovy wrote:
> Dear R-helpers,
>
> I wasn't able to find out how to override the alphabetical ordering
> of the rows and columns in a vcd::mosaic plot. I would like to have
> them each ordered by numerical values in a different column of the
> data frame that contains the contingency data.
>
> I would be most grateful for a pointer toward the solution.
I don't know that particular function, but most functions in R treat the
categorical variables as factors, and use the ordering of the factor
levels in displays. So you need to set this ordering explicitly, rather
than let R do it automatically:
#automatic gets alphabetical order
> x <- factor(c("red", "green", "blue"))
> x
[1] red green blue
Levels: blue green red
#explicit gets whatever you want
> x <- factor(c("red", "green", "blue"), levels=c("red", "green", "blue"))
> x
[1] red green blue
Levels: red green blue
Duncan Murdoch
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