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/*
* (C) Copyright 2014- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation
* nor does it submit to any jurisdiction.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "ectrans/transi.h"
#define TRANS_CHECK( CALL ) do {\
int errcode = CALL;\
if( errcode != TRANS_SUCCESS) {\
printf("ERROR: %s failed @%s:%d:\n%s\n",#CALL,__FILE__,__LINE__,trans_error_msg(errcode));\
abort();\
}\
} while(0)
/*! @example transi_sptogp.c
*
* Transform spectral to gridpoint
*
* This is an example of how to setup and
* transform global spectral data to
* global gridpoint data
*/
// Following dummy functions are implementation details
// that don't contribute to this example. They could be
// replaced with grib_api functionality
void read_grid( struct Trans_t* trans );
void read_rspecg( struct Trans_t* trans, double* rspecg[], int* nfrom[], int* nfld );
void write_rgpg( struct Trans_t* trans, double* rgpg[], int nfld );
int main ( int arc, char **argv )
{
trans_use_mpi(0);
int jfld;
struct Trans_t trans;
TRANS_CHECK(trans_new(&trans));
// Read resolution information
read_grid(&trans);
// Register resolution in trans library
TRANS_CHECK( trans_setup(&trans) );
// Declare global spectral data
int nfld;
double* rspecg = NULL;
int* nfrom = NULL;
// Read global spectral data (could be from grib file)
read_rspecg(&trans,&rspecg,&nfrom,&nfld);
// Distribute data to all procs
double* rspec = malloc( sizeof(double) * nfld *trans.nspec2 );
struct DistSpec_t distspec = new_distspec(&trans);
distspec.nfrom = nfrom;
distspec.rspecg = rspecg;
distspec.rspec = rspec;
distspec.nfld = nfld;
TRANS_CHECK(trans_distspec(&distspec));
// Transform sp to gp fields
double* rgp = malloc( sizeof(double) * nfld*trans.ngptot );
struct InvTrans_t invtrans = new_invtrans(&trans);
invtrans.nscalar = nfld;
invtrans.rspscalar = rspec;
invtrans.rgp = rgp;
TRANS_CHECK( trans_invtrans(&invtrans) );
// Gather all gridpoint fields
double* rgpg = NULL;
if( trans.myproc == 1 )
rgpg = malloc( sizeof(double) * nfld*trans.ngptotg );
int* nto = malloc( sizeof(int) * nfld );
for( jfld=0; jfld<nfld; ++jfld )
nto[jfld] = 1;
struct GathGrid_t gathgrid = new_gathgrid(&trans);
gathgrid.rgp = rgp;
gathgrid.rgpg = rgpg;
gathgrid.nfld = nfld;
gathgrid.nto = nto;
TRANS_CHECK( trans_gathgrid(&gathgrid) );
// Write global spectral data (could be to grib file)
if( trans.myproc == 1 )
write_rgpg(&trans,&rgpg,nfld);
// Deallocate and finalize
free(rgp);
free(rgpg);
free(rspec);
free(rspecg);
free(nfrom);
free(nto);
TRANS_CHECK( trans_delete(&trans) );
TRANS_CHECK( trans_finalize() );
return 0;
}
//---------------------------------------------------------------------------
// Dummy functions, used in this example
void read_grid(struct Trans_t* trans)
{
int i;
trans->ndgl=160;
trans->nloen=malloc(sizeof(int)*trans->ndgl);
for( i=0; i<trans->ndgl; i++) trans->nloen[i] = trans->ndgl*2;
// Assume Linear Grid
trans->nsmax=1279;
//(2*trans->ndgl-1)/2;
}
void read_rspecg(struct Trans_t* trans, double* rspecg[], int* nfrom[], int* nfld )
{
int i;
int jfld;
if( trans->myproc == 1 ) printf("read_rspecg ...\n");
*nfld = 2;
if( trans->myproc == 1 )
{
*rspecg = malloc( sizeof(double) * (*nfld)*trans->nspec2g );
for( i=0; i<trans->nspec2g; ++i )
{
(*rspecg)[i*(*nfld) + 0] = (i==0 ? 1. : 0.); // scalar field 1
(*rspecg)[i*(*nfld) + 1] = (i==0 ? 2. : 0.); // scalar field 2
}
}
*nfrom = malloc( sizeof(int) * (*nfld) );
for (jfld=0; jfld<(*nfld); ++jfld)
(*nfrom)[jfld] = 1;
if( trans->myproc == 1 ) printf("read_rspecg ... done\n");
}
void write_rgpg(struct Trans_t* trans, double* rgpg[], int nfld )
{
int jfld;
if( trans->myproc == 1 ) printf("write_rgpg ...\n");
for( jfld=0; jfld<nfld; ++jfld )
{
// output global field rgpg[jfld]
}
if( trans->myproc == 1 ) printf("write_rgpg ... done\n");
}
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