Ok I have checked the version of R, and I am using 2.7.
I was looking at my log files, and noticed that I get an error that
looks like this:
[EMAIL PROTECTED] httpd]$ tail error_log
In function (filename = "Rplot%03d.png", width = 480, height = 480, :
unable to open connection to X11 display ''
Traceback (most recent call last):
File "./parameter_derivation.py", line 623, in ?
a.makeStatRealChart(fileName)
File "./parameter_derivation.py", line 540, in makeStatRealChart
r.png(fileName, width = 480, height = 640)
rpy.RPy_RException: Error in X11(paste("png::", filename, sep = ""),
width, height, pointsize, :unable to start device PNG
So it does look like it is the issue with Xwindows, but since I have R
version 2.7, why am I getting this error?
Thanks
> You also may want to try to use the PDF graphics device in R (function pdf)
> and then use
> convert (http://imagemagick.org) to make a PNG for viewing on the web. This
> is the method I
> have used with great success in my Django-dataplot package
> (http://django-dataplot.sf.net),
> which is a RPy plotting package for the Django web framework.
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Barry
> Rowlingson
> Sent: Monday, June 16, 2008 6:02 AM
> To: RPy help, support and design discussion list
> Subject: Re: [Rpy] zero byte images
> Patrick Jackson wrote:
>> Hello all I need your help. I currently have a website that calls a python
>> script that uses rpy to create graphs. When I run the script from the
>> console it works great but when I run the script via the website it is only
>> creating a zero byte png file.
>> r.png(fileName, width = 480, height = 640)
> What version of R? In all but the most recent R, the png() function
> requires an X Window Server. When you run it interactively it uses the
> one in front of you, when run from Apache, it doesn't have one.
> Upgrade R to 2.7 and try again.
> Barry
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