[R] plotting symbol

[Chuck Cleland]

Peter Dalgaard wrote:
> Chuck Cleland wrote:
>> Federico Calboli wrote:
>>  
>>> Hi All,
>>>
>>> can I have a plot where the symbol for the dots is smaller than pch 
>>> =20 but bigger than pch = '.'?
>>>     
>>
>>   Have you considered using the cex argument to reduce the size of
>> pch=20?
>>
>> X <- rnorm(20)
>>
>> par(mfrow=c(2,2))
>> plot(X, pch=20, cex=1.0)
>> plot(X, pch=20, cex=0.6)
>> plot(X, pch=20, cex=1.5)
>> plot(X, pch=".")
>>
>>   
> Notice though, that it depends on the device. On X11 (presumably Windows
> too) at "normal" resolutions, you really have only one sice which is
> less than the default. Try e.g.
> 
> plot(1:10, rep(0,10), pch=20,cex=seq(1,.1,,10))

Peter:
  Thanks for making that point, which certainly did not occur to me.  I
see the same thing with the windows device with pointsize at the default
of 12 (win.graph too).  With pointsize=15 I can get two sizes smaller
than the default.  And on the pdf device I get many sizes less than the
default.

>>> Best,
>>>
>>> Fede
>>>
>>> -- 
>>> Federico C. F. Calboli
>>> Department of Epidemiology and Public Health
>>> Imperial College, St. Mary's Campus
>>> Norfolk Place, London W2 1PG
>>>
>>> Tel +44 (0)20 75941602   Fax +44 (0)20 75943193
>>>
>>> f.calboli [.a.t] imperial.ac.uk
>>> f.calboli [.a.t] gmail.com
>>>
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-- 
Chuck Cleland, Ph.D.
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