R help - Jul 2006 - Plotting lines and points on the second plot when using gap.plot in plotrix

Hi

My question is simple - the gap.plot function in the plotrix package
allows users to draw graphs that have a broken axis.  However, I want to
then add a line to the "second" plot, but can't.

Eg:

twogrp<-c(rnorm(10)+4,rnorm(10)+20)
gap.plot(twogrp,rnorm(20),gap.bounds=c(8,16),gap.axis="x",xlab="X
values",
       xtics=c(4,7,17,20),ylab="Y values",main="Plot gap on X
axis")

# this doesn't work
points(17,0,col="red")

# this does work
points(4,0,col="green")

I somehow need to set the focus to the second plot so that I can draw
lines and points on it.

Any help?

Mick

I've answered my own question, the x-values of the line/points I want to
plot must be adjusted by the gap size

Thanks
Mick 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of michael watson
(IAH-C)
Sent: 19 July 2006 11:58
To: r-help at stat.math.ethz.ch
Subject: [R] Plotting lines and points on the second plot when
usinggap.plot in plotrix

Hi

My question is simple - the gap.plot function in the plotrix package
allows users to draw graphs that have a broken axis.  However, I want to
then add a line to the "second" plot, but can't.

Eg:

twogrp<-c(rnorm(10)+4,rnorm(10)+20)
gap.plot(twogrp,rnorm(20),gap.bounds=c(8,16),gap.axis="x",xlab="X
values",
       xtics=c(4,7,17,20),ylab="Y values",main="Plot gap on X
axis")

# this doesn't work
points(17,0,col="red")

# this does work
points(4,0,col="green")

I somehow need to set the focus to the second plot so that I can draw
lines and points on it.

Any help?

Mick

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and provide commented, minimal, self-contained, reproducible code.

you need to subtract the length of gap in y-axis.
Good luck!

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