On 08/03/17 11:26, Nikos Alexandris wrote:

NikosAlexandris wrote:

Dear list,

where is the extension for SQLite that contains the (mathematical) log
function available to download?  As referenced in
https://grass.osgeo.org/grass73/manuals/v.db.update.html.

Helmut Kudrnovsky:

I think the reference in the manual requires a source or a link to it.

just found something in the wiki:

https://grasswiki.osgeo.org/wiki/Build_SQLite_extension_on_windows

For Linux:

gcc extension-functions.c -fPIC -shared -o libextensionfunctions.so


Note,

1) there is still a "compile" warning for the code (no time to hunt)
2) The log() function does not like, naturally, 0 values. But this can
be workedaround with a where SQL clause.


Can we not integrate this into GRASS?  It feels awkward to have to spend
so much time for a log or similar function to use in a v.db.update call.


-1

I don't think we should start interalizing solutions to issues related to database backend choice.

Moritz
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