[R] Data labels in barchart (lattice)

[Deepayan Sarkar]

On 4/21/08, K. Elo <maillists at nic.fi> wrote:
> Dear all,
>
>  I use the barchart-function (lattice) for plotting stacked barcharts.
>  The data is a summary table (data frame) of likert-scale-evaluations
>  (strongly agree, agree...strongly disagree) to different issues
>  constructed as follows (L1=precentage of "strongly agree" evaluations,
>  L4=precentage of "strongly disagree" evaluations):
>  ---
>  ID      L1      L2      L3      L4      DN
>  Issue1  25      40      35      0       0
>  Issue2  15      30      22      28      5
>  .
>  .
>  .
>  ---
>  What I have so far not achieved is adding data labels to each "sub-bar"
>  of a 100%-bar. What I would like to have is something like this:
>
>  Issue1: |###25%###OOOOOO40%OOOOOOXXX35%XXX
>  Issue2: | (similar)
>  ...
>
>  What should I do in oder to display data labels?

Write your own panel function (which may or may not be a simple
exercise depending on your level of expertise in R). You could use
panel.barchart as a starting point. Basically, you need to insert some
calls to panel.text() (or something equivalent) after calls to
panel.rect() that draw the bars.

-Deepayan