[GRASS-dev] GNU scientific library in GRASS

[Jarek Jasiewicz]

Soeren Gebbert pisze:
> Hello,
>
> 2010/4/13 Jarosław Jasiewicz <jarekj at amu.edu.pl>:
>   
>> Hi All!
>>
>> What about using GNU scientific library  (gsl) in GRASS module?
>>
>> Will it create additional dependencies?
>>     
>
> Yes.
>
>   
>> What about compiling on windows?
>> Any other contraindications??
>>
>> In general what I want to use I cannot find in gmath library.
>>     
>
> What kind of algorithms are missing in gmath library?
>   
thanks for answer and hint.

In general I have almost created module (v.surf.trend) to fit 
polynominal 2,5D surface to set of points (in theory any order of 
plynominal, but in fact up to 6  or 10 order).
I used for it gsl_multifit_linear and gsl_multifit_linear_svd wich work 
for now well on sample dataset
now   I try to expeand it with some addational functions like 
gsl_multifit_wlinear and gsl_multifit_linear_est (rather experimentally)

and finally must create GRASS io and interface section to finish it.

I look into ccmath and what I found is pplsq, but I'm not sure I will 
easily expand it to 2D surface (it differs form gsl which is genearlly 
based on "Numerical recipies..."). I do not  know ccmath I saw it for 
the first time so I cannot surely say there is all I need.
In general it is possible to solve problem with some additional 
programing effort but with gsl I have given solution.

On the other hand gsl is in practice available in almost all linux 
installation except these most limited...

Again thanks for answer. I think now I will finish it on my way and 
start test, and next I can think about rewrite it with ccmath for GRASS 7

Jarek.


**
> GRASS7 already includes a numerical library called ccmath. Have a look
> in the gmath-ccmath wrapper in lib/gmath.
> Currently only a few algorithms from ccmath are used: eigenvalue
> computation, LU decomposition and SVD solver. Have a look at the
> ccmath library (http://freshmeat.net/projects/ccmath/). Maybe the
> algorithms you are searching for is present there? If this is the case
> we can add it to grass7.
>
> Sören
>
>   
>> thanks for any answer
>> J.
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