https://github.com/scarrazza/nnpdfdriver

The NNPDF stand-alone driver
https://github.com/scarrazza/nnpdfdriver

Last synced: about 1 month ago
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The NNPDF stand-alone driver

• Host: GitHub
• URL: https://github.com/scarrazza/nnpdfdriver
• Owner: scarrazza
• License: gpl-3.0
• Created: 2015-01-09T19:47:37.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2016-02-11T17:56:06.000Z (almost 9 years ago)
• Last Synced: 2023-04-05T22:47:19.127Z (over 1 year ago)
• Language: C++
• Homepage: http://nnpdf.hepforge.org/
• Size: 31.3 KB
• Stars: 1
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# nnpdfdriver 

NNPDF stand-alone drivers for C++ and Fortran77 which

can be easily included in any program. The drivers use as input the

official LHAPDF5 and LHAPDF6 (c++) grids at [lhapdf.hepforge.org/](lhapdf.hepforge.org/).

## Download

Checkout the latest release at https://github.com/scarrazza/nnpdfdriver/releases

## Compile

```Shell

cd nnpdfdriver/cpp or nnpdfdriver/fortran

make

```

## Run

```Shell

# run example

./testcode

```

## Code example

```C++

/**

 * NNPDF tutorial: Loading and using a NNPDF grid with the NNPDF Driver.

 *

 * Compile with:

 * g++ -O3 tutorial.cc NNPDFDriver.cc -o prog

 *

 * Author: The NNPDF Collaboration - 2014

 */

 

#include "iostream"

#include "cmath"

#include "NNPDFDriver.h"

using namespace std;

 

int main()

{

  NNPDFDriver *nnpdf = new NNPDFDriver("NNPDF23_nlo_as_0119.LHgrid");

  nnpdf->initPDF(0); // initialize PDF member

 

  // or use the fast option: grid name + replica number

  // NNPDFDriver *nnpdf = new NNPDFDriver("NNPDF23_nlo_as_0119.LHgrid", 0);

 

  double x = 0.1, Q = sqrt(2);

  int f = 0;

  cout << nnpdf->xfx(x,Q,f) << endl; // prints the gluon x*PDF

 

  delete *nnpdf;                 

   

  return 0;

}

```

A minimilist fortran interface is provided

```C++

  void initnnset_(const char* setname); // set the PDF name

  void initpdf_(int *mem); // change member

  double nnxfx_(double *x, double *Q, int *id); // return x*PDF

```