[GRASS-dev] Re: Fix for gis.m profile dialog division by zero

[Maris Nartiss]

Hi Michael,

it will divide by zero on any non-normal map - think of binary map (1,null).
It has no sense for such maps to create profiles, but it does not mean
that gis.m should fail if user is dumb. It's one of my thisweekends
efforts to make gis.m foolproof. :)

Maris.

2007/2/11, Michael Barton <michael.barton at asu.edu>:
> Maris,
>
> Do you know what is making this divide by 0 and under what circumstances
> (e.g., range of elevation values on map, location/projection
> characteristics)? On my system, with a build of 2 days ago, the profiling
> works fine with the "normal" map of the Spearfish 30m DEM.
>
> This happened a couple times before when the GRASS module used for
> calculating the total elevation range was giving incorrect information in
> certain circumstances and when there were changes in the function of
> g.region flags. It was an example of the cascade of effects that can happen
> if a module function is changed in seemingly minor ways.
>
> The error trapping is a good idea in any case. But I want to make sure we
> also understand the cause rather than just treat the symptoms.
>
> Michael
>
>
> On 2/10/07 12:30 PM, "grass-codepatches at wald.intevation.org"
> <grass-codepatches at wald.intevation.org> wrote:
>
> > code patches item #281, was opened at 2007-02-10 21:30
> > Status: Open
> > Priority: 3
> > Submitted By: M?ris Nartišs (marisn)
> > Assigned to: Nobody (None)
> > Summary: Fix for gis.m profile dialog division by zero
> > Patch status: None
> > Patch type: fix
> > GRASS component: gis.m
> > GRASS version: CVS HEAD
> > GRASS CVS checkout date, if applies (YYMMDD): 070210
> >
> >
> > Initial Comment:
> > This patch prevents gis.m profile tool from dividing by zero and makes
> popup
> > windows to appear on top of profile window and not gis.m main window.
> >
> > ----------------------------------------------------------------------
> >
> > You can respond by visiting:
> >
> http://wald.intevation.org/tracker/?func=detail&atid=205&aid=281&group_id=21
> >
> >
>
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
>
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
>
>