[Qgis-user] Using the ##passfilename tag for R script in Processing Toolbox

[Ned Horning]

Hi Victor -

Yes, I am using the version of Processing that comes with QGIS 2.0.1.

I played with it some more today and I don't get an error if I use 
##passfilenames (I added an "s" at the end) but it still didn't seem to 
work. I'm assuming that using ##passfilename will simply declare the 
directory path and file name as a variable instead of actually opening 
the file. It's quite possible I don't understand the intended 
functionality.

Can you let me know the best way to make comments or make feature 
requests related to the R scripting capability. I'm glad I finally got 
around to trying it out.

All the best,

Ned

On 02/11/2014 04:41 PM, Victor Olaya wrote:
> Hi Ned
>
> That looks like a bug when parsing the script code. I will check to 
> see what I can do.
>
> Are you using the latest version of Processing, or the one that comes 
> with QGIS 2.0.1?
>
>
> 2014-02-10 23:03 GMT+01:00 Ned Horning <horning at amnh.org 
> <mailto:horning at amnh.org>>:
>
>     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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