On Thu, Feb 22, 2018 at 12:39 PM, Markus Metz
<markus.metz.gisw...@gmail.com> wrote:
> On Thu, Feb 22, 2018 at 10:05 AM, Helmut Kudrnovsky <hel...@web.de> wrote:
>> Vilem Ded wrote
>> > My questions:
>> > Is there a way how to effectively apply function(command) by group?
>> > Is the v.hull function supposed to work like this (ingnoring where and
>> > cat arguments)?


> From the manual:
> layer=string
>     Layer number or name ('-1' for all layers)
>     Default: -1
> You need to set the layer option to some positive number, otherwise all
> points from all layers will be used and the cats and where options are
> ignored.

I have added a related note to the v.hull manual page (maybe others
should be extended as well?).

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