[R] two connected graphs

[Paul Murrell]

Hi


Charles C. Berry wrote:
> On Thu, 14 Dec 2006, Robin Hankin wrote:
> 
>> Hi
>>
>> I have two datasets, A and B, consisting of two columns of numbers
>> representing x and y coordinates.
>>
>> They have 10 and 6 rows respectively.
>>
>> I want to plot two scattergraphs, one above the other.
>>
>> The lower graph to contain A (10 points) and the upper
>> graph to contain B (six points).
>>
>> The x-axes of the two graphs must line up.
>>
>> I then want to draw straight lines that connect points
>> of  B to a particular point (or points)  of A.
>>
>> How do I do this?
> 
> Use the grid package.
> 
> You'll want to study the xscale arg of the viewport function (to set up 
> your two plots using the same scale)
> 
> Calls to grid.move.to, seekViewport, and grid.line.to can be used to 
> connect points in different plots (viewports)


See the example in "The grid Graphics Package" R News 2(2)
http://cran.r-project.org/doc/Rnews/Rnews_2002-2.pdf

Paul


>> [...]
> 
> Charles C. Berry                        (858) 534-2098
>                                           Dept of Family/Preventive Medicine
> E mailto:cberry at tajo.ucsd.edu	         UC San Diego
> http://biostat.ucsd.edu/~cberry/         La Jolla, San Diego 92093-0717
> 
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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
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