[Qgis-user] Processing: how to use input parameter in "Select by expression"

[Victor Olaya]

The expression field in the selection algorithm is of type String. You
can connect any model input or algorithms output of that same type.
Since your 'year' input is of type number, it cannot be connected :-(

It would be great to be able to derive strings from other strings or
numbers, but that's not yet implemented

Hope this helps

2015-01-16 6:46 GMT+01:00 Andreas Neumann <a.neumann at carto.net>:
> Along the lines - I am generally unsure how I can connect input parameters
> in algorithms. Sometimes they magically appear in the algorithm to be
> chosen. Sometimes they don't. Is there a general way to connect input
> parameters to be used as variables for algorithm parameters?
>
> Thanks,
> Andreas
>
>
> On 16.01.2015 06:34, Andreas Neumann wrote:
>>
>> Hi,
>>
>> In QGIS processing I would like to do the following:
>>
>> Input Parameters:
>> - Vector Layer
>> - Numeric input parameter (year)
>>
>> Use the "select by expression" algorithm.
>>
>> Question: how can I use the value of the "year" input variable to be used
>> in the expression. Is there a special syntax to retrieve the values of input
>> parameters?
>>
>> Thanks a lot!
>>
>> Andreas
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>
>
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