[GRASS-dev] Extracting a subset from a set of (vector) points

[Damiano Triglione]

OK, I'll have a look at v.out.ascii.db: it will be, also, a good occasion to 
refresh my knowledge about unix shell scripts!
Thank you very much,
Damiano

----- Original Message ----- 
From: "Hamish" <hamish_nospam at yahoo.com>
To: "Damiano Triglione" <damiano.triglione at polimi.it>
Sent: Friday, January 26, 2007 12:25 AM
Subject: Re: [GRASS-dev] Extracting a subset from a set of (vector) points


> Damiano Triglione wrote:
>> Yes, I tried -n, and other options (-d and -g) available in sort, but
>> none of them gives the optimal result!
>> It's strange: it's like join can work properly only for numerical
>> fields that are sorted in "two ways simultanously" (numerical and
>> lexicographical) but... this is impossible (if the field can change
>> dimension), so it never works perfectly in the cases I am interested
>> in! I succeded in solving my problem using the Grass command
>> "v.extract", but I have still the intellectual interest in finding
>> out how to exploit "join". I thought it was a bug of an old version,
>> but also in recent version join works in the same weird way... Maybe
>> I should try the latest version.
>
>
> maybe have a look at the v.out.ascii.db shell script (wiki add-ons)
>
> I used "join" there, and it works.
>
>
> Hamish