[Qgis-user] combine field calculator functions

[Carlos Cerdán]

... or perhaps you can:

0. Add the new column, acording type od data and length and... save and
close QGIS (no data added).
1. Open the *.DBF table with LibreOffice Calc or MS Excel, to take
advantage of their functions
2.  Calc-Excel formulas would be taken as text, so you have to overwrite
them with their own results
3.  Save (as *.DBF).
4. Open the shape in QGIS. It will have the new data.
5. An "advanced" step 2 is add new columns directly in Calc/Excel. For
that, watch the headers: they have: name_of_camp , type_of_data , lenght

Good luck

Carlos Cerdán




2013/8/6 Nathan Woodrow <madmanwoo at gmail.com>

> Hey Micheal,
>
> This is currently not possible.  If you are running QGIS 1.9 you do have
> the ability to define your own functions using Python example here
> https://github.com/NathanW2/qgsexpressionsplus/blob/master/functions.py however
> if you are new to Python and QGIS this isn't something I would do right
> away.
>
> - Nathan
>
>
> On Tue, Aug 6, 2013 at 9:38 PM, Michael Giebels <giebels at meo-carbon.com>wrote:
>
>>  Hello QGIS users,
>>
>> the QGIS world is new to me, so please be gentle...
>>
>> I am wondering how I could combine field calculator functions in order to
>> convert information from an existing data column into a new one.
>> What I can do with my mediocre knowledge is to query information from
>> column 1 by setting
>>
>> "column1"='abc'
>>
>> which gives me a binary result (0,1) in my resulting column. Then I can
>>
>> replace ("newcolumn",'1','6')
>>
>> How could I combine these two into one working function (i.e. there MUST
>> be a simple expression in the function list) and do not lose the new number
>> when querying another information (e.g. 'cba') from column 1?
>>
>> Thanks in advance!
>>
>> Michael
>>
>>
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>
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