Hi -
I am trying to learn to write R scripts using the Processing Toolbox. I
have a random forest image classification script that works in the
processing toolkit but I'd like to modify it to do more complex tasks. I
think I need to use the ##passfilename tag but every time I add that to
a script I get an error that I pasted below. I tried several different
scripts and every time I add the ##passfilename tag I get the same
error. Does the ##passfilename tag need other parameters? If anyone
knows what the problem might be or has pointers about how I can find the
problem please let me know?
This R scripting capability has a lot of potential and I'd like to write
a guide on how to use it but I still have a lot to learn myself.
All the best,
Ned
I'm running QGIS 2.0.1 on Ubuntu 12.04. This is the error message:
--
An error has occured while executing Python code:
Traceback (most recent call last):
File
"/usr/share/qgis/python/plugins/processing/r/EditRScriptDialog.py", line
95, in runAlgorithm
alg = RAlgorithm(None, unicode(self.text.text()))
File "/usr/share/qgis/python/plugins/processing/r/RAlgorithm.py",
line 71, in __init__
self.defineCharacteristicsFromScript()
File "/usr/share/qgis/python/plugins/processing/r/RAlgorithm.py",
line 82, in defineCharacteristicsFromScript
self.parseDescription(iter(lines))
File "/usr/share/qgis/python/plugins/processing/r/RAlgorithm.py",
line 108, in parseDescription
raise WrongScriptException("Could not load R script:" +
self.descriptionFile + ".\n Problem with line \"" + line + "\"")
TypeError: cannot concatenate 'str' and 'NoneType' objects
Python version:
2.7.3 (default, Sep 26 2013, 20:13:52)
[GCC 4.6.3]
QGIS version:
2.0.1-Dufour Dufour, exported
Python path: ['/usr/share/qgis/python/plugins/processing',
'/usr/share/qgis/python', '/home/nedhorning/.qgis2/python',
'/home/nedhorning/.qgis2/python/plugins',
'/usr/share/qgis/python/plugins', '/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/PIL',
'/usr/lib/python2.7/dist-packages/gst-0.10',
'/usr/lib/python2.7/dist-packages/gtk-2.0',
'/usr/lib/pymodules/python2.7',
'/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
'/usr/lib/python2.7/dist-packages/ubuntuone-client',
'/usr/lib/python2.7/dist-packages/ubuntuone-installer',
'/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol',
'/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode',
'/usr/share/qgis/python/plugins/fTools/tools']
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