No, that's not the idea off ##passfilename, the idea is that, instead of getting an R variable that is already a vector/raster layer, you get a string with its filename, so you can use it in R as you like. This was mainly done to allow the user to open a raster layer using a different package, and not use a fixed one and provide the layer object directly. So, if you declare a variable "mylayer" as vector layer, Processing will ask the user to select a vector layer, but the "mylayer" variable will have the path to the selected file. If you do not use ##passfilename, Processing will add some extra code, so the variable will already point to a data object created based on that filename.
You can update to the newer version using the plugin manager. You should enable the "show experimental plugins" option, and you will see a new version of Processing. To make feature requests, you can use the QGIS issue tracker. Thanks in advance! 2014-02-11 22:51 GMT+01:00 Ned Horning <horn...@amnh.org>: > 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 <horn...@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'] >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/qgis-user >> > > >
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