[R] Line Type Specification: lty="<on><off>" but lty="<off><on>"?

[Peter Alspach]

Tena koe Henrik

Not exactly what you are requesting but you could draw a solid line and then the dashed line over the top:

plot(1:10, panel.first=abline(0, 1, col='red', lwd=2), panel.last=abline(0, 1, col='blue', lty='88', lwd=2))

or

plot(1:10)
abline(0, 1, col='red', lwd=2)
abline(0, 1, col='blue', lty='88', lwd=2))

This may be system or graphics device dependent (I'm using Windows).

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Henrik Bengtsson
> Sent: Monday, 11 October 2010 10:50 a.m.
> To: r-help
> Subject: [R] Line Type Specification: lty="<on><off>" but
> lty="<off><on>"?
> 
> Hi,
> 
> Section 'Line Type Specification' in help(par) explains how you can do
> custom line types.  For example:
> 
> plot(NA, xlim=c(0,1), ylim=c(0,1));
> abline(h=1/2, col="blue", lwd=2, lty="88");
> 
> will draw a dashed line segment where the line is composed of 8 units
> of "on" (blue color) and 8 units of "off" (transparent), then
> repeated.
> 
> Now I'd like to draw a second red line overlapping this one, but where
> the "gaps" are now red.  Technically, I think the following would
> define that:
> 
> abline(h=1/2, col="red", lwd=2, lty="0880");
> 
> that is 0 "on", 8 "off", 8 "on" (red color) and 0 "off", then repeated.
> 
> However, zeros are not allowed (actually, why not?)
> 
> Any suggestions to draw one red and one blue dashed lines that, if
> overlapping, the the overlapping segments will be blue, red, blue,
> red, ...?
> 
> /Henrik
> 
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> PLEASE do read the posting guide http://www.R-project.org/posting-
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> and provide commented, minimal, self-contained, reproducible code.

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