/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2009 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM; if not, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Application
    graphTest

Description
    Test program for making graphs

\*---------------------------------------------------------------------------*/

#include "graph.H"
#include "OFstream.H"
#include "mathematicalConstants.H"

using namespace Foam;

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

int main()
{
    scalarField x(100);
    scalarField r(x.size());

    forAll(x, i)
    {
        x[i] = -3 + 0.06*i;
    }

    scalarField b = 0.5*(1.0 + erf(x));
    scalarField c = 1.0 - b;
    scalarField gradb = (1/::sqrt(mathematicalConstant::pi))*exp(-sqr(x));
    scalarField lapb = -2*x*gradb;

    r = lapb*b*c/(gradb*gradb);


    graph("r", "x", "r", x, r).write("r", "xmgr");

    Info<< "end" << endl;

    return(0);
}


// ************************************************************************* //