[R] plotting

[yoooooo]

Hi, let's say I have data

x = c(1, 2, 10, 12)
y = c(100, -20, 50, 25)

if I go plot(x, y), then the default x-axis range goes from 1 to 12. Is
there a way to change it so that the axis looks like:

----|-----|-----|-----|----
     1       2       10     12

This doesn't seem reasonable but let's say I want to plot intraday graph
with axis.POSIXct, my data is only from 8:30 to 4 every day and I have these
data for days.. i don't want to see a straight line every night.. Is there a
way I can do this? 

Thanks!!!
-yoooooooooooooooooo






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