[R] Very simple question on plot

[Duncan Murdoch]

On 12/13/2007 8:16 AM, Ronaldo Reis Junior wrote:
> Hi,
> 
> I try to make a plot like this:
> 
> Y |
>   |
>   |               o  
>   |         o        o
>   |     o               o
>   |  o                     o
>   |o                         o   o
>   |--------------------------------
>    0 10 20 30 40 50 60 70 80 90 100 (A)
>  100 90 80 70 60 50 40 30 20 10 0   (B)
> 
> or
> 		B
>   100 90 80 70 60 50 40 30 20 10 0
> Y |--------------------------------
>   |
>   |               o  
>   |         o        o
>   |     o               o
>   |  o                     o
>   |o                         o   o
>   |--------------------------------
>    0 10 20 30 40 50 60 70 80 90 100
> 		A
> 
> A and B are complementary variables.
> 
> How is the best way to make this plot?
> 

Plot Y versus A, then use the axis() function to add another axis and 
mtext to label it.  For example,

Y <- rnorm(101)
A <- 0:100
plot(A, Y)
B <- 100-A
ticks <- pretty(B)
axis(side=3, at=100-ticks, labels=ticks)
mtext("B", side=3, line=3)

You may need to adjust par(mar=) to get large enough margins for some 
more elaborate versions.

Duncan Murdoch