[Qgis-user] Error in simple calculation in Field Calculator

[Wolf-E. Altmann]

Am 07.02.2014 13:18, schrieb magerlin:
> Are anybody able to get the right results when doing this calculation in
> field calculator on a shape file:
>
> FromToStop = 100000 * From_stop + To_stop
>
> <http://osgeo-org.1560.x6.nabble.com/file/n5102486/Attribute_table.png>
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> I know there is a limit on 10 digits working with integers but using
> integers (the two first columns) or real (the two next columns) makes only
> one difference:
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> Using real gives the right results as a start, but when the file is saved
> and reopened the results are wrong (negative number from adding two positive
> numbers!). I have also tested both integer and real for the result column
> FromToSTop with no luck.
>
> A test file is here:  Test.zip
> <http://osgeo-org.1560.x6.nabble.com/file/n5102486/Test.zip>
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> I suppose it is some kind of overflow but I get no error messages or
> warnings at all.
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> -----
> Regards Morten
>
> Qgis 2.0.1 OSGeo,
> Windows 7, 64bit
> --
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Hello Morten,

for me your target-field "FromToStop" seems to be an integer-field. 
Maybe it's the reasen?

Wolf