readPicture function (grImport package) not working on Linux (F22) - linux

Question

I'm trying to read an ps.xml file using grImport library (http://cran.r-project.org/web/packages/grImport/vignettes/import.pdf)
Here is my code:
require("gridBase")
require("grImport")
require("plotrix")
petal <- readPicture("petal.ps.xml")
And this is the error I'm getting:
Error in if (x == 0) 1 else if (x == 1) 0 else x :
missing value where TRUE/FALSE needed
Here is my session information
> sessionInfo()
R version 3.2.0 (2015-04-16)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: Fedora 22 (Twenty Two)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] plotrix_3.5-12 grImport_0.9-0 XML_3.98-1.3 gridBase_0.4-7
The same code works on a Linux F20 with the following session information
> sessionInfo()
R version 3.2.0 (2015-04-16)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: Fedora 20 (Heisenbug)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] plotrix_3.4-8 grImport_0.8-4 XML_3.96-1.1 gridBase_0.4-6

Answer 1

I struggled with the same problem and eventually solved it by regenerating the xml with PostScriptTrace on the other platform. When comparing the files generated on the two platforms, I found that the failing image file was missing attributes in the path/context/style element. I was able to manually add the missing attributes lineend, linemitre, and linejoin and load the images.
I suspect that those missing elements are the source of the problem in some versions of grImport.