writePk.cc 6.37 KB
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#include "Parser.hh"
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#include "Timer.hh"
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#include "Class/MnClassEngine.hh"
#include"cxxsupport/cxxutils.h"
#include"cxxsupport/fitshandle.h"
#include <iostream>
#include<fstream>
#include<numeric>
#include<string>
using namespace std;


/*
Utlities to check the CLASS Pk spectrum: fixed nodes location + inetrpolated values

author : S. Plaszczynski, Aug.2017
*/

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static bool abs_compare(double a, double b)
{
  return (std::abs(a) < std::abs(b));
};
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static void logspace(double kmin,double kmax, int npks,vector<double>&v){
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  double lmax=std::log(kmax);
  double lmin=std::log(kmin);
  double step=(lmax-lmin)/(npks-1);

  v.resize(npks);
  for (int i=0;i<npks;i++){
    double lval=lmin+step*i;
    v[i]=std::exp(lval);
  }
}


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static void linspace(double kmin,double kmax, int npks,vector<double>&v){
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  double step=(kmax-kmin)/(npks-1);
  v.resize(npks);
  for (int i=0;i<npks;i++){
    double kval=kmin+step*i;
    v[i]=kval;
  }
}





int main(int argc,char** argv){

  planck_assert(argc==3 || argc==4,"Usage: writePk parfile(in) file.fits(out) z_pk(in)");

  assert_present(argv[1]);


  float z0 = 0.;
  if (argc==4) z0=atof(argv[3]);
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  //decodage arguments
  Parser parser(argv[1]);

  //choose engine
  string engine= parser.params.find<string>("engine","CLASS");
  if (engine=="pico") {
    throw  Message_error("pico cannot be used for Pk !");
  }

  ClassParams classparms(parser.classparms);
  classparms.add("output","mPk"); //polar +lens+clphi
  
  classparms.add("z_pk",z0); //polar +lens+clphi
  

  //no lensing
  try{
    size_t i=classparms.findIndex("lensing");
    cout << "setting lensing to false" << endl;
    classparms.updateVal(i,str(false));
  }
  catch (Message_error&){
    classparms.add("lensing",false);
  }
  
  //define kmax and kvalues either from file either given by k_end

    double kmax=-1;
    vector<double>  kval;
    string kvfile=parser.params.find<string>("kval_file","");
    bool h_rescale=parser.params.find<bool>("h_rescale",false);
    //if file
    if (kvfile.size()!=0) {
      assert_present(kvfile);
      cout <<"using k values from file=" <<kvfile <<endl;
      //decode 1st column
      ifstream f(kvfile.c_str());
      string line;
      double kk;
      while (getline(f,line)) {
	//skip comments
	if (line.find("#",0) !=std:: string::npos) continue;
	std::istringstream str(line);
	if (str>>kk) {
	  kval.push_back(kk);
	}
      }
      kmax=kval.back();
    }
    else{
      kmax = parser.params.find<double>("kmax",1);
      const int npks = parser.params.find<int>("n_pks",1000);
      const double kmin = parser.params.find<double>("kmin",8.e-4);
      bool lin=parser.params.find<bool>("linspace",false);
      lin? linspace(kmin,kmax,npks,kval) : logspace(kmin,kmax,npks,kval) ; 
      
    }
    //modify class param accordingly
    string label=(h_rescale? "P_k_max_h/Mpc" : "P_k_max_1/Mpc");
    cout << label << " set to " << kmax <<endl;

    try{
      size_t i=classparms.findIndex(label);
      classparms.updateVal(i,dataToString(kmax));
    }
    catch (Message_error&){
      classparms.add(label,kmax);
    }


  //precision file
  string pre="";
  if (parser.params.param_present("precisionFile")){
    pre=Parser::CheckPath(parser.params.find<string>("precisionFile",""));
  }
  
  
  cout << "CLASS \t--> precision parameters taken from file=" <<  pre << endl;
  MnClassEngine* e=new MnClassEngine(parser.vars(),
		      classparms,
		      pre);
 

  cout << "Computing P(k) at z=" << z0 << endl;
  ClassEngine* klass=e->getClass();

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  cout << "Omega_m=" << e->Omega_m() << "\tomega_m=" << e->Omega_m()*e->get_h()*e->get_h() << endl;
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  cout << "sigma8(0)=" << e->get_sigma8(0) << "\tsigma8(" << z0 << ")=" <<  e->get_sigma8(z0) << endl;


   //test fast Pk
  Timer timer;
  const size_t nloop=100;
  cout << "hasPK? " << (int)e->has_PkNL() << "\t" << klass->has_PkNL() << endl;
  cout <<"Pk timer test..." << endl;
  vector<double> pkslow(kval.size());
  for (size_t i=0;i<nloop;i++){
    for (size_t k =0; k<kval.size() ; k++){
      pkslow[k]=e->get_Pk(kval[k], z0);
    }
  }  
  cout << "std=" << timer.partial() <<endl;

  vector<double> pkfast(kval.size());
  for (size_t i=0;i<nloop;i++) e->get_Pkvec(kval,z0,pkfast);
  cout << "fast=" << timer.partial() <<endl;
  //check ouptut
  vector<double> residual(kval.size());
  std::transform(pkfast.begin(),pkfast.end(),pkslow.begin(),
		 residual.begin(),std::minus<double>());

  double diff=*max_element(residual.begin(),residual.end(),abs_compare);
  cout << "max diff=" << diff << endl;

  //fits output
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  const std::string fileName(argv[2]);
  cout << "writing FITS file =" << fileName << endl;
  if (file_present(fileName)) {
    //std::cout << "the file " + fileName + " already exists: removing"<<endl;
    remove_file(fileName);
  }
  fitshandle fout(fileName,fitshandle::CREATE, READWRITE);

  bool do_nl =e->has_PkNL();
  
  //nodes
  {
    std::vector<fitscolumn> pkcols;
    pkcols.push_back(fitscolumn("knode", "1/Mpc",1,TDOUBLE));
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    pkcols.push_back(fitscolumn("pklin", "(Mpc)^3" ,1,TDOUBLE));
    if (do_nl) pkcols.push_back(fitscolumn("pknl", "(Mpc)^3" ,1,TDOUBLE));
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    fout.insert_bintab(pkcols);
    
    vector<double> knode, pknode,pknodeNL;
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    klass->get_PklinNodes(knode,pknode);

    if (do_nl) klass->get_PkNLNodes(knode,pknodeNL);
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    for (size_t i=0;i<knode.size();i++){
      fout.write_column(1,knode[i],i);
      fout.write_column(2,pknode[i],i);
       if (do_nl) fout.write_column(3,pknodeNL[i],i);
    }



  }

  //interp values
  {
    std::vector<fitscolumn> pkcols;
    pkcols.push_back(fitscolumn("k", "1/Mpc",1,TDOUBLE));
    pkcols.push_back(fitscolumn("pklin", "(Mpc)^3" ,1,TDOUBLE));
    if (do_nl) pkcols.push_back(fitscolumn("pknl", "(Mpc)^3" ,1,TDOUBLE));

    fout.insert_bintab(pkcols);
    
    //optional rescale
    double h=e->get_H0()/100;
    //warning h_rescaling
    if (h_rescale)
      std::transform(kval.begin(),kval.end(),kval.begin(),bind1st(multiplies<double>(),h));
    cout <<"computing Pk from " << kval[0] << " to " << kval.back() << endl;

    for (size_t i=0;i<kval.size();i++){
      fout.write_column(1,kval[i],i);
      fout.write_column(2,klass->get_Pklin(kval[i],z0),i);
      if (do_nl) fout.write_column(3,klass->get_PkNL(kval[i],z0),i);
    }
    cout <<"Growth factor D(z=" << z0 << ")="<< klass->get_growthD(z0) << endl;
    fout.add_key("D",klass->get_growthD(z0),"growth factor");
    fout.add_key("f",klass->get_f(z0),"growth rate");

  }
  
  fout.close();




  delete e;

  return 0;
}