mirror of
https://github.com/cosmo-sims/MUSIC.git
synced 2024-09-19 17:03:46 +02:00
8d9068852e
* added baryon staggering for SPH * added 2LPT for baryons/DM two-component fluid * cleaned up some code
49 lines
998 B
C++
49 lines
998 B
C++
/*
|
|
|
|
numerics.cc - This file is part of MUSIC -
|
|
a code to generate multi-scale initial conditions
|
|
for cosmological simulations
|
|
|
|
Copyright (C) 2010 Oliver Hahn
|
|
|
|
*/
|
|
|
|
#ifdef WITH_MPI
|
|
#ifdef MANNO
|
|
#include <mpi.h>
|
|
#else
|
|
#include <mpi++.h>
|
|
#endif
|
|
#endif
|
|
#include <iostream>
|
|
#include "Numerics.hh"
|
|
|
|
|
|
#ifndef REL_PRECISION
|
|
#define REL_PRECISION 1.e-5
|
|
#endif
|
|
|
|
real_t integrate( double (* func) (double x, void * params), double a, double b, void *params )
|
|
{
|
|
gsl_function F;
|
|
F.function = func;
|
|
F.params = params;
|
|
|
|
double result;
|
|
double error;
|
|
|
|
|
|
gsl_set_error_handler_off ();
|
|
gsl_integration_workspace *w = gsl_integration_workspace_alloc(100000);
|
|
gsl_integration_qag( &F, a, b, 0, REL_PRECISION, 100000, 6, w, &result, &error );
|
|
|
|
|
|
gsl_integration_workspace_free(w);
|
|
|
|
gsl_set_error_handler(NULL);
|
|
|
|
if( error/result > REL_PRECISION )
|
|
std::cerr << " - Warning: no convergence in function 'integrate', rel. error=" << error/result << std::endl;
|
|
|
|
return (real_t)result;
|
|
}
|