Hi Sophie, On Tue, Jun 12, 2018 at 4:26 PM, Sophie Crommelinck < sophie.crommeli...@gmail.com> wrote:
> Hello, > > I am unable to figure out why a certain processing algorithm > (v.net.steiner) works fine in QGIS2, but not in QGIS3. I am using the same > line and point layer with the same cost column. The input data as well as > the cost column are the only parameters that I define, the others remain > the default ones. > > In QGIS2 the processing history looks like this: > > > *processing.runalg("grass7:v.net.steiner","C:/xxx/linesLayer.shp","C:/xxx/nodeLayer.shp",50,2,"1-100000","boundary",-1,False,"794057.939937,794307.889937,9833916.58837,9834082.13837",-1,0.0001,0,None)* > ... note that there are no parameter names coded. But here: [...] In QGIS3 the processing history looks like this: > > *processing.run("grass7:v.net <http://v.net>.steiner", > {'input':'C:/xxx/linesLayer.shp','points':'C:/xxx/nodeLayer.shp','threshold':50,'arc_type':[0,1],'terminal_cats':'1-100000','acolumn':'boundary','npoints':-1,'-g':False,'output':'G:/1_QGIS_Temp_files/processing_f8ef30794232406cb21d5d7cc1d06809/4774808dfe284dafafd9a15a9879a5c1/output.shp','GRASS_REGION_PARAMETER':None,'GRASS_SNAP_TOLERANCE_PARAMETER':-1,'GRASS_MIN_AREA_PARAMETER':0.0001,'GRASS_OUTPUT_TYPE_PARAMETER':0})* > ... here yes. And v.net.steiner does not have a "points" parameter, see https://grass.osgeo.org/grass74/manuals/v.net.steiner.html *v.net.steiner* [-*g*] *input*=*name* *output*=*name* [*arc_type*=*string*[, *string*,...]] [*arc_layer*=*string*] [*node_layer*=*string*] [*acolumn*= *string*] *terminal_cats*=*range* [*npoints*=*integer*] [--*overwrite*] [-- *help*] [--*verbose*] [--*quiet*] [--*ui*] Hence this error: > No result is created. The error messages indicate that the point layer > cannot be used: > > *FEHLER: v.net.steiner: Sorry, <points> is not a valid parameter* > The bug seems to be in this file https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/grass7/description/v.net.steiner.txt I'd suggest you open a bug report with QGIS on this. best, Markus -- Markus Neteler, PhD http://www.mundialis.de - free data with free software http://grass.osgeo.org http://courses.neteler.org/blog
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