[Qgis-user] HELP! Search Query Builder has limited operators

[Marco Hugentobler]

You need to make the layer editable in order to use the calculator. Click on 
the pencil icon. After calculation, click on it again to save the changes to 
disk (or to discard).

Regards,
Marco

Am Montag, 8. Februar 2010 15.10:45 schrieb badaveil:
> Dr. Thank you again for a fast reply.
> 
> I open a map, then open the attribute table, yes, I see the field
> calculator, however, only the first 4 icons on the left until the magnifine
> glass are active, the rest including the field calculator are not active.
> How do I activate it? So close but yet so far.
> 
> Abbas
> 
> On 8 February 2010 16:17, Marco Hugentobler <marco at hugis.net> wrote:
> > Hi Abbas
> >
> > Use the field calculator (calculator button in the attribute table).
> > There you
> > have an area button and you may create a field with the feature area with
> > it
> > (or use arithmetic expression that contain the feature area).
> >
> > Regards,
> > Marco
> >
> > Am Montag, 8. Februar 2010 09.10:58 schrieb badaveil:
> > > I want to calculate the areas of specific plots of land (polygon). In
> > > Mapinfo, the Search Query Builder has an "area" operator to help to do
> > > this. However in QGIS, this basic function is missing and I am lost.
> > > Please advice. Thanks
> > >
> > > Abbas
> >
> > --
> > Dr. Marco Hugentobler
> > HUGIS - GIS programming and consulting
> > Webereistrasse 66
> > CH-8134 Adliswil
> > marco at hugis.net
> > http://homepage.hispeed.ch/hugis
> > Technical Advisor QGIS Project Steering Committee
> 

-- 
Dr. Marco Hugentobler
HUGIS - GIS programming and consulting
Webereistrasse 66
CH-8134 Adliswil
marco at hugis.net
http://homepage.hispeed.ch/hugis
Technical Advisor QGIS Project Steering Committee