> I have a basis question regarding the use of color in the lattice
package. I
> read the ?barchart help page and searched the R archives but could not
> understand how to do it.
>
> I just need to plot a barchart using specific colors for my groups, e.g.
> green and red instead of the default lattice colors. How do I do that?
>
> If I say:
> barchart(x ~ a_factor, groups=my_groups, data=my_data,
col=c('green',
> 'red'), auto.key=TRUE)
>
> then my barplot has the correct colors, but the legend does not. What is
the
> correct approach to set colors in barchart?
Two possibilities:
1. Manually specify the colours of the rectangles in the key by using the
key argument instead of auto.key
my_cols <- c("green", "red", "blue")
barchart(yield ~ site,
groups=variety,
data = barley,
col=my_cols,
key=list(text=list(levels(barley$variety)),
rectangles=list(col=my_cols)))
2. Set superpose.polygon$col in the plot settings instead of using the col
argument, e.g.
barchart(yield ~ site,
groups=variety,
data = barley,
auto.key=TRUE,
par.settings=list(superpose.polygon=list(col=my_cols)))
Regards,
Richie.
Mathematical Sciences Unit
HSL
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