[R] add lines() to 1st plot in layout() after calling 2nd plot()?

Marianne Promberger marianne.promberger at kcl.ac.uk
Sun Oct 4 11:10:37 CEST 2009

Thanks for the quick reply. However ...

David Winsemius <dwinsemius at comcast.net> 03-Oct-09 20:50:
MP> layout(matrix(c(1,2),1))
MP> plot(1:10,main="left plot")
MP> plot(10:1,main="right plot")
MP> lines(c(3:7,7:3),col="red")
MP> but of course now lines() gets added to the "right plot". I
MP> Is there any way to make the lines() go to the fist plot ("left  
MP> plot")?
> If you look at layout's help page there appears to be a worked example  
> of an even more complex task. The answer appears to be assingning  
> numbers to regions and then inserting par(mar=  with an appropriately  
> constructed destination arguments prior to each added piece.

Sorry, but I fail to find the solution in the page returned by
?layout, assuming that's what you mean.

Yes, the numbers in the matrix given to layout() give the order of
where plots will be put, so 



plot(1:10,main="left plot")
plot(10:1,main="right plot")

puts "left plot" on the right hand side and "right plot" on the
left. But the lines() still go to the "right plot" plot (now on the
left hand side) which gets called last.

The par(mar ... of the "scatterplot with marginal histograms" example
just set the margins of the histogram plots, then they get plotted to
the region with the next number given in the layout() matrix.

Maybe I'm missing something.



> -- 
> David
> On Oct 3, 2009, at 3:15 PM, Marianne Promberger wrote:
>> Dear R users,
>> I create a graphic with two plots side by side using layout(), like  
>> this:
>> layout(matrix(c(1,2),1))
>> plot(1:10,main="left plot")
>> lines(c(3:7,7:3),col="red")
>> plot(10:1,main="right plot")
>> The lines() obivously get added to the "left plot" plot.
>> Now, I'm trying to write a function that builds up a plot bit by bit  
>> to
>> then include it in a LaTeX presentation with overlays. I'm using
>> dev.copy(), and it would make my life much easier (because in fact I
>> call all sorts of additional axis() etc after plot) if I could call
>> the above commands in this order:
>> layout(matrix(c(1,2),1))
>> plot(1:10,main="left plot")
>> plot(10:1,main="right plot")
>> lines(c(3:7,7:3),col="red")
>> but of course now lines() gets added to the "right plot". I
>> Is there any way to make the lines() go to the fist plot ("left  
>> plot")?
>> Marianne
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
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Marianne Promberger PhD, King's College London
R version 2.9.2 (2009-08-24)
Ubuntu 9.04

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