[R] Color barplots with a conditional?

R. Michael Weylandt <michael.weylandt@gmail.com> michael.weylandt at gmail.com
Thu Sep 15 02:40:35 CEST 2011

You've almost got it. If your category variables are factors, then adding col=data$category to plot() will do it automatically since factors will be coerced to their integer representation. If you want a different color map, you can do arithmetic transformations on the integer codings directly as well. 

Let me know if I can clarify this further. 

Michael Weylandt

On Sep 14, 2011, at 4:14 PM, Allie818 <alice.ly at gmail.com> wrote:

> I've made a barplot that has several bars. I'd like the bars to be colored
> according to the type of category they are in. Is there a way to put a
> conditional into the color parameter in barplot?
> i.e. if data$category[i] == 1, color the bar red
> Do I need to generate the coloring sequence before the plot code first?
> Thanks!!
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