William,
Thanks. I adapted your example by doing:
library(psych)
pdf(file="myfile.pdf",width=30,height=30)
pairs.panels(data,gap=0)
dev.off()
The R part worked. I could see it doing so when I replaced the call to
'pdf' by
windows(width=30,height=30)
. The remaining problem was that Adobe Reader only displayed ten rows of
my file, and then hung. That doesn't surprise me, because it's an
unreliable piece of software, often hanging on PDFs I find on Google.
Annoying, though.
Jocelyn Paine
http://www.j-paine.org
http://www.spreadsheet-parts.org
+44 (0)7768 534 091
On Tue, 31 Aug 2010, William Revelle wrote:
Jocelyn,
In a partial answer to your question, try setting gap=0 in the calls to
pairs. This will make the plots closer together.
(You might also find pairs.panels in the psych package useful, -- it
implements one of the help examples for pairs to report the histogram on the
diagonal and reports the correlations in the upper off diagonal).
On a Mac, I just tried setting
quartz(width=30, height=30) #make a big graphics window
#then
library(psych)
my.data <- sim.item(24) #create 500 cases of 24 variables
pairs.panels(my.data, gap=0) #the gap =0 makes the plots right next to each
other
#And then save the graphics window as a pdf. I can open this in a pdf and
scroll around pretty easily.
Bill
At 5:21 AM +0100 8/31/10, Jocelyn Paine wrote:
I've got a data frame with 23 columns, and wanted to plot a scatterplot
matrix of it. I called
pairs( df )
where 'df' is my data frame. This did generate the matrix, but the plotting
window did not expand to make the individual plots large enough to see.
Each one was only about 10 pixels high and wide.
I tried sending the plot to a file, with a high and wide image, by doing
png( "plot.png", width = 4000, height = 4000 )
but I got these errors:
Error in png( "plot.png", width = 4000, height = 4000 ) :
unable to start device
In addition: Warning messages:
1: In png( "plot.png", width = 4000, height = 4000 ) :
Unable to allocate bitmap
2: In png( "plot.png", width = 4000, height = 4000 ) :
opening device failed
The messages aren't helpful, because they don't tell you _why_ R can't
start the device, allocate it, or open it. The documentation for png says:
Windows imposes limits on the size of bitmaps: these are not documented
in the SDK and may depend on the version of Windows. It seems that width
and height are each limited to 2^15-1.
However, 2^15-1 is 32767, so that isn't the problem here. I tried various
values for height and width. 2400 was OK, but 2500 wasn't. So it seems R
can't produce plots that are more than about 2400 pixels square. This is
with R 2.10.1.
Why is png failing on big images? Also, what's the recommended way to make
a file containing a scatterplot matrix when you have lots of variables?
'pairs' is a very useful function, but obviously one does need to be
careful when doing this, and I don't know what experts would recommend. Do
you loop round the variables plotting each pair to a different file? I was
hoping that I could put them all into one very big image and view parts of
it at a time.
Thanks,
Jocelyn Paine
http://www.j-paine.org
http://www.spreadsheet-parts.org
+44 (0)7768 534 091
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--
William Revelle http://personality-project.org/revelle.html
Professor http://personality-project.org
Department of Psychology http://www.wcas.northwestern.edu/psych/
Northwestern University http://www.northwestern.edu/
Use R for psychology http://personality-project.org/r
It is 6 minutes to midnight http://www.thebulletin.org
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.