[R] bar plot issues

[Uwe Ligges]

On 20.10.2011 18:03, Henri-Paul Indiogine wrote:
> Hi!
>
> I have 2 problems in drawing a stacked bar plot:
>
> (1)  This is a stacked bar plot with more than 100 bars next to each
> other.  So there should not be names at the bottom of the bars because
> the bars are too narrow.    I tried arg.names=NULL but that does not
> work because R uses the row names from the data.frame.
>
> How can I suppress the placing of names below the bars?


It is the argument *names.arg* and it has to be set to NA.


> (2) The position of the legend is problematic. The legend is big, more
> than 20 items. It overlays the bars themselves and makes the plot
> unreadable.  I would like to move it outside the plot and have tried
> legend("topleft") but R complains about missing information.

arrange it outside by, e.g. increasing the size of margins (see argument 
"mar" in ?par) and place a separate legend (see ?legend) into the 
margins (see xps argument in ?par).


> Here is what I have so far
>
> ########################################################
> barplot(t(file.codes),
> +         beside = FALSE,
> +         col = rainbow(ncol(file.codes)), names.arg=NULL,
> +         legend = FALSE,
> +         main = "Presidential documents - Codes per document",
> +         xlab = "document", ylab = "number of codings")
> #######################################################

Not reproducible since we do not have file.codes.


Uwe Ligges



> Any ideas?
>
> Thanks,
> Henri-Paul
>
>