[R] direction of axes of plot

[Spencer Graves]

      If you want code that will work in both S-Plus and R, please use 
this solution;  Ross Ihaka's solution using xlim=rev(range(x)) uses 
fewer commands and may be more elegant but generates errors in S-Plus 
(6.2 and, I suspect, earlier releases as well, though I did not test 
them just now).  Best Wishes, Spencer Graves

Marc Schwartz wrote:

>On Sun, 2004-06-27 at 18:24, XIAO LIU wrote:
>  
>
>>R users:
>>
>>I want X-Y plotting with axes in reverse direction such as (0, -1, -2,
>>-3, ....).  How can I do it?
>>
>>Thanks in advance
>>
>>Xiao
>>    
>>
>
>If I am understanding what you want, the following should give you an
>example:
>
># Create x and y with negative values
>x <- -1:-10
>y <- -1:-10
>
># Show regular plot
>plot(x, y)
>
># Now plot using -x and -y
># Do not plot the axes or annotation
>plot(-x, -y, axes = FALSE, ann = FALSE)
>
># Now label both x and y axes with negative
># labels. Use pretty() to get standard tick mark locations
># and use rev() to create tick mark labels in reverse order
>axis(1, at = pretty(-x), labels = rev(pretty(x)))
>axis(2, at = pretty(-y), labels = rev(pretty(y)))
>
>HTH,
>
>Marc Schwartz
>
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