Re: [Opengrads-devel] Fishy finite differencing

[Arlindo da S. <da...@al...>]

On Feb 4, 2008 9:22 AM, Michael Fiorino <Mic...@no...> wrote:

> hi arlindo,
>
> i'll take this on, for the lat-lon grids and if you can send me the refs
> and the algorithm, i'll give it a go.


Will do. Start mplementing the off-pole case which uses uncentered
differences. I'll send you later details about the polar cap case.


>  can you point me to the precise
> fish udx code i need to work?  thanks, also it seem more consistent to
> leave the gauss-spec version as a separte udx.
>

Start with the v1.9.0-rc1 code base:

% gacvs co -r grads-1_9_0-rc1 -P Grads   (notice capital "G")

Then look under extensions

% cd Grads/extensions
% cvs upd -A        (do this at this level the first time so it will be
easier to check in)
% cd fish

The files are:

fish.c --- fish() and the other functions are here, this is C.
fishpak.f --- the generic f77 eliptic solver
fish.udxt.in --- "function table", maps the function names as seen inside
grads
                        to the function names in fish.c; make sure you edit
fish.udxt.in and
                        not fish.udxt
ftn_fish.F --- front end for fishpak.F
GNUmakefile --- makefile
utFish.gs --- sample script, add more stuff as you implement more functions.

  Let me know if you have questions.

              Arlindo

-- 
Arlindo da Silva
da...@al...