[GRASS5] Severe bug in r.mapcalc!! [raghavan@media.osaka-cu.ac.jp: Bugreport GRASS 5]

[Andreas Lange]

Hi Markus ,

i could verify the problem on Intel/x86 and the absence of the problem
on SGI/MIPS (IRIX) (32bit system). 

I suspect that this is a big-endian/little-endian related problem. But i
could be wrong. Would be interesting to get test results from other
platforms (PPC, SPARC, Alpha, HP PA-RISC etc.). 

Are there any hints on where to look for the problem (library used,
files written)?

cu,

Andreas

Markus Neteler wrote:
> 
> On Fri, Jul 28, 2000 at 09:59:15AM -0500, Bill Brown - staff wrote:
> >
> >  r.mapcalc test=-129
> >
> > This works OK on my IRIX machine.  As with other negative
> > numbers, it's stored using a full 4-byte int (in cellhd file,
> > "format: 3").  Do other negative numbers work OK?
> 
> Thanks for testing. Obviously yes (on Linux):
> 
> r.mapcalc test=-128
> EXECUTING test = ...  100%
> CREATING SUPPORT FILES FOR test
> range: -128 -128
> 
>  -> o.k.
> 
> GRASS:~ > r.mapcalc test=-129
> EXECUTING test = ...  100%
> CREATING SUPPORT FILES FOR test
> 
>  -> NULL!!!
> 
> GRASS:~ > r.mapcalc test=-130
> EXECUTING test = ...  100%
> CREATING SUPPORT FILES FOR test
> range: -130 -130
> 
>  -> o.k.
> 
> This is a very strange error.
> 
> Markus
> 
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-- 
Andreas Lange, 65187 Wiesbaden, Germany, Tel. +49 611 807850
Andreas.Lange at Rhein-Main.de - A.C.Lange at GMX.net



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