Re: [Qgis-developer] Does Sextante Field Calculator support all functions of attribute table field calc?
Hi Anita and sorry for late response. Advanced calculator used a bit different syntax — field names should be included in , so your formula will look like value = $geom.area() / area You can find documentation here (nfortunately only in Russian) http://gis-lab.info/qa/fieldpyculator.html On Thu, 18 Apr 2013 19:15:24 +0200 Anita Graser anitagra...@gmx.at wrote: On Thu, Apr 18, 2013 at 9:21 AM, Alexander Bruy alexander.b...@gmail.comwrote: BTW, there is also Advanced Field Calculator that should allow calculate area and perform much more complex calculations Could you show me how? value = $area / area causes Traceback (most recent call last): File C:\OSGeo4W\apps\qgis-dev\python\plugins\sextante\core\GeoAlgorithm.py, line 147, in execute self.processAlgorithm(progress) File C:\OSGeo4W\apps\qgis-dev\python\plugins\sextante\algs\FieldPyculator.py, line 125, in processAlgorithm unicode(sys.exc_info()[0].__name__), unicode(sys.exc_info()[1])) TypeError: __init__() takes exactly 2 arguments (4 given) -- Alexander Bruy ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] Does Sextante Field Calculator support all functions of attribute table field calc?
Hi Anita, Field calculator in SEXTANTE is very simple calculator based on Python eval() function. So it allows only basic math with native data types and some string operations (like concatenation). Seems we need to improve it and add QgsExpression support. BTW, there is also Advanced Field Calculator that should allow calculate area and perform much more complex calculations On Wed, 17 Apr 2013 22:42:05 +0200 Anita Graser anitagra...@gmx.at wrote: Hi, I have a polygon layer with an area field and want to calculate $area / area. This works well in attribute table field calculator. If I try to use Sextante Field Calculator, the resulting field contains only NULL values. Is this supposed to work? Is this a bug you can confirm? Best wishes, Anita -- Alexander Bruy ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] Does Sextante Field Calculator support all functions of attribute table field calc?
On Thu, Apr 18, 2013 at 9:21 AM, Alexander Bruy alexander.b...@gmail.comwrote: BTW, there is also Advanced Field Calculator that should allow calculate area and perform much more complex calculations Could you show me how? value = $area / area causes Traceback (most recent call last): File C:\OSGeo4W\apps\qgis-dev\python\plugins\sextante\core\GeoAlgorithm.py, line 147, in execute self.processAlgorithm(progress) File C:\OSGeo4W\apps\qgis-dev\python\plugins\sextante\algs\FieldPyculator.py, line 125, in processAlgorithm unicode(sys.exc_info()[0].__name__), unicode(sys.exc_info()[1])) TypeError: __init__() takes exactly 2 arguments (4 given) Thanks! Anita On Wed, 17 Apr 2013 22:42:05 +0200 Anita Graser anitagra...@gmx.at wrote: Hi, I have a polygon layer with an area field and want to calculate $area / area. This works well in attribute table field calculator. If I try to use Sextante Field Calculator, the resulting field contains only NULL values. Is this supposed to work? Is this a bug you can confirm? Best wishes, Anita -- Alexander Bruy ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
