plot(1:10, pch=letters[1:10])

On Mon, Aug 1, 2011 at 4:44 AM, Andrew McCulloch <amccul39@yahoo.co.uk>wrote:

> Hi,
>
> I use R to draw my graphs. I have 100 points on a simple xy-plot. The
> points are
> distinguished by a third variable which is categorical with 10 levels. I
> have
> been plotting x against y and using gray scales to distinguish the level of
> the
> categorical variable for each point. It looks ok to me but a journal
> reviewer
> says this is not any use. I cannot afford to pay for colour prints. Any
> ideas on
> what is the best way to distinguish 10 groups on an xy scatter plot?
>
>
>
> If all else fails I can just remove the graph and give them a table of
> regression coefficients.
>
>
> Thanks.
>
> Yours Sincerely
> Andrew McCulloch
>
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