[R] how to plot y-axis on the right of x-axis

[Jim Lemon]

On 08/26/2010 08:11 AM, elaine kuo wrote:
> ...
> One more request, if the label of axis X wants to be drawn from 5 to 1
> (left to right)
> rather than 1 to 5, is it fine to change axis (4, at = NULL) ?
> If so, which value should be input ?
>

Hi Elaine,
There are a couple of ways to do this. One is to use the revaxis 
function (plotrix) that reverses the conventional direction of the axes 
by silently changing the sign of the values. If you use this, you must 
remember to change the sign of the position of your y axes. Another way 
is the plot in the normal direction but print the tick labels backwards:

plot(1:5,xaxt="n")
axis(1,1:5,5:1)

Using this method, you have to remember that your labels don't 
correspond to the values, so if you wanted a y axis positioned at x=4, 
you would have to use:

axis(2,1:5,pos=2)

Jim