[R] How to add two different axis to one plot?

[Andrew Robinson]

Use the axis() command to add custom axes.

To "hold" the plot, insert

par(new=TRUE)

between the plot statements, thus:

plot(x1, y1, etc ...)
par(new=TRUE)
plot(x2, y2, etc ...)



Andrew

On Mon, January 30, 2006 2:49 pm, Michael said:
> Hi all,
>
> I need to put two different axis to one plot. On the top of the plot, I
> need
> to put one axis, with increments from left side to the right side; then at
> the bottom of the same plot, I need to put another axis, with increments
> from right side to the left side and showing a different unit. How do I do
> that?
>
> By the way, is there a "hold" command for plotting?
>
> If I first plot a picture, how to add another "plot" command onto it
> without
> erasing it?
>
> In matlab, it can be convinient done by "hold on" and "hold off"... and
> can
> I do it in R?
>
> Thanks a lot,
>
> Micheal
>
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>
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Andrew Robinson
Senior Lecturer in Statistics                       Tel: +61-3-8344-9763
Department of Mathematics and Statistics            Fax: +61-3-8344 4599
University of Melbourne, VIC 3010 Australia
Email: a.robinson at ms.unimelb.edu.au    Website: http://www.ms.unimelb.edu.au