[GRASS-dev] Write array to (point) attribute table

[Paulo van Breugel]

On Wed, Sep 30, 2015 at 2:02 AM, Anna Petrášová <kratochanna at gmail.com>
wrote:

>
>
> On Tue, Sep 29, 2015 at 6:09 PM, Paulo van Breugel <p.vanbreugel at gmail.com
> > wrote:
>
>> This must be a very basic question, but I can't find an easy/direct way
>> to do this. In python, if I have an array with values with a length equal
>> to the number of rows in an attribute table of a (point) vector layer, how
>> can I write those values to a new column in that attribute table. I can of
>> course first create the column, but than how to update that column with the
>> values in the array?
>>
>
> it should be pretty easy to do with pygrass, unfortunately there is no
> example on assigning attributes in the official documentation [1],  but it
> should be pretty easy, something like that (not tested):
>
> with VectorTopo('myvector', mode='w') as vectormap:
>     for feature in vectormap:
>         feature.attrs['mycolumn'] = value
>
>
> Thanks, but that seems to write the vector back without attribute table



> Anna
>
> [1]
> https://grass.osgeo.org/grass70/manuals/libpython/pygrass_vector.html#working-with-vector-objects
>
>>
>> Cheers,
>>
>> Paulo
>>
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>
>
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