[babakflame]

Dear Fellows

I am trying to add a variable called rhoE into my createFields.H file and assign a value to it based on location in the grid.

I have added the following lines into my createFields.H file:

volScalarField yPos = mesh.C().component(vector::Y);
    volScalarField xPos = mesh.C().component(vector::X); 

    Info<< "Reading field electric density rhoE\n" << endl;
    volScalarField rhoE
    (
        IOobject
        (
            "rhoE",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );

    forAll(rhoE.internalField(), patchi)
    {
        if (xPos [patchi] < 10)
    {
        rhoE.internalField()[patchi]=exp(-yPos[patchi]);
    }
    else 
    {
        rhoE.internalField()[patchi]= 0;
    }
    }

However, after compiling my code, it gives the following error:

createFields.H: In function ‘int main(int, char**)’:
createFields.H:183:49: error: call of overloaded ‘exp(double)’ is ambiguous
createFields.H:183:49: note: candidates are:
In file included from /usr/include/math.h:69:0,
                 from /usr/include/c++/4.7/cmath:46,

Would somebody hint me how can I remove this error?