[R] direction of axes of plot
Marc Schwartz
MSchwartz at MedAnalytics.com
Mon Jun 28 02:08:41 CEST 2004
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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