[GRASS-dev] Bugs in i.cca module

[Markus Neteler]

Hi Māris, all,

On Wed, Nov 15, 2023 at 8:35 AM Maris Nartiss via grass-dev
<grass-dev at lists.osgeo.org> wrote:
>
> Hello devs,
> Just playing around I decided to run i.cca module. Seems that it has
> been broken since 2009(!) (there is a bug report from 2014 in Trac
> [1]). I managed to fix the segfault [2] but it left me with a
> different problem – the module runs just fine but produces NULLs as an
> output. This boils down to at one point trying to calculate sqrt from
> negative numbers. I am not that familiar with the CCA algorithm
> implemented in the module and thus have no idea if it is a bug in the
> code or just bad input data.
>
> I hope somebody can help me to sort this out or provide a working example,
> Māris.

Digging in my inbox I found this thread from 2009:
https://lists.osgeo.org/pipermail/grass-dev/2009-August/045656.html

It contains some discussion and examples. Maybe not much of a help but
a kind of pointer.

Markus

> 1. https://trac.osgeo.org/grass/ticket/2297
> 2. https://github.com/OSGeo/grass/pull/3239
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-- 
Markus Neteler, PhD
https://www.mundialis.de - free data with free software
https://grass.osgeo.org
https://neteler.org/blog