axis segment breaks

[microbedr]

I would like to introduce segment breaks into the x-axis of a plot I
have generated. The x-axis is a continuous scale, say,
c(-1000:1000). I would like to have the left segment of the scale be
c(-1000:-500) and occupy only say, 5% of the physical length of the x-
axis, and then have the right segment occupy the remaining 95% of the
x-axis length with the range c(100:1000). Often you see these plots
with a break denoted as "-/ /-". Can anyone assist me here?

Thanks so much, Joel

[Hadley Wickham]

Hi Joel,

This is not currently possible in ggplot2. I'm ambivalent about this
type of display. You can get something very similar with facetting if
you really want to do it.

Hadley

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[microbedr]

Thanks for your prompt response. I'm plotting a response vs.
log10(dose) where one of the concentrations is zero (the rest are,
say, 3,10,30,100,300). I've been setting the 0 concentration to 0.1
be able to visualize the response and then introducing the "-//-"
breaks I mentioned using a gui software package to generate figures
for display. I was hoping to accomplish the same task and stay within
R. Any suggestions from anyone on how to accomplish what I would like
to do would be appreciated. Thanks again, Joel

[Hadley Wickham]

It's hard to offer concrete advise without seeing the data, but given
the amount of manipulation you're doing to the x-axis, have you
considered making concentration a factor?

Hadley

[Dennis Murphy]

Hi:

I tend to agree with Hadley about the wisdom of using breaks in a plot, but there is a function to do this sort of thing in the plotrix package.

RSiteSearch('break plot axis')

scared up the function axis.break() in plotrix as the first hit. I presume it's meant for base graphics, though.

HTH,
Dennis