Hello,

I am in the process of writing a Perl program to carry out and analyze
large numbers of regressions using R as the regression engine, and I am
using Statistics::R to create the communication bridge between the two
programs.  Statistics::R creates a pipe between R and Perl and uses
Rterm.exe (hidden during run-time) to carry out the R commands.  This
communication bridge works well for creating regression objects in R and
analyzing some of the regression results.  However, I have not been able
to create a plot using this method.  The plot commands that are executed
in R through Perl (see below) produce a pdf file with no data (i.e. the
plot data is not getting passed to the file).  It seems that the pipe
connection created via Statistics::R cannot produce a graphics device
window to save.  A very simple version of the commands that I am using
in my Perl program are as follows:

$R->send(qq (xVal <- c(1,2,3,4,5,6)));
$R->send(qq (yVal <- c(3,5,2,6,1,5)));  
$R->send(qq (pdf("C:/Test Environment/R/perlPlotTest.pdf")));
$R->send(qq (plot(xVal, yVal)));
$R->send(qq (graphics.off()));

As the code indicates, I am using R's pdf function to create a pdf file
containing the plot of xVal and yVal.  I am using the graphics.off()
function rather than the dev.off() function as I get an error message of
"<simpleError in dev.off(): cannot shut down device 1 (the null
device)>" when dev.off() is used.  Is there another way to generate and
save a plot using the bridge connection that I described?  If not, what
would be an efficient way of generating and saving plots from within my
Perl program?  Any help would be greatly appreciated.

Thank you,
Ryan



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