[Qgis-user] Problem with virtual field in field calculator

[magerlin]

I've got a text attribute which contains intervals like "2 - 4".

I would like to convert it to an attribute of type Real containing the start
value of the interval.

This formula used to store the result in a "normal" attribute of type Real
works as expected:

toreal( (substr("interval" ,1,strpos ("interval" ,'-')-1)))

The same formula used to store the result in a virtual attribute of type
Real *results in NULL values*.

Looking at the Fields tab of the layer properties shows one difference*:

Both the "normal" and the virtual attribute has "Type" double while the
"normal" attribute has "Type name" Real and the virtual attribute has "Type
name" double. Don't know if that means anything?

Both attributes has length 8 and precision 2.



-----
Regards Morten

Currently using Qgis 2.4.0 (OSGeo4),
Windows 7, 64bit
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