[R] mosaic row and column order

[Achim Zeileis]

On Wed, 31 Oct 2007, Duncan Murdoch wrote:

> 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.

...and this is exactly what mosaic() in "vcd" does. Thanks for the
explanation, Duncan.
Z

> 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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