[sonGoku]

i tried to declare an array of type volScalarfield as-
volScalarField Xsi
(
IOobject
(
"Xsi",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar("Xsi", dimless, 0)
);



volScalarField
(
IOobject
(
"Xsi[" + std::to_string(4) + "]",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::NO_WRITE
),
mesh,
Xsi[4]
);





which compiled well

but when I added eqn in my main code as-
fo<< "\nCalculating Xsi\n" << endl;
for(int i =0 ; i<5 ; i++)
{ volScalarField& Xsii = Xsi[i];
while (pimple.correctNonOrthogonal())
{
fvScalarMatrix XsiiEqn
(
fvm::ddt(Xsii)-pow(1-Xsii,n)*A_1*exp(-Ea_1/(R*T))
== fvOptions(Xsii)
);




fvOptions.constrain(XsiiEqn);
XsiiEqn.solve();
fvOptions.correct(Xsii);

}}


it displayed compilation error as follows-
error: invalid initialization of reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from expression of type ‘double’
{ volScalarField& Xsii = Xsi[i];
^
/home/anshul/OpenFOAM/OpenFOAM-dev/wmake/rules/General/transform:25: recipe for target '/home/anshul/OpenFOAM/OpenFOAM-dev/platforms/linux64Gcc62DPInt32Opt/applications/solvers/basic/ablationFoam/ablationFoam.o' failed



I don't know if there is problem in my declaration of array or initialization of field Xsii

Pls anyone Guide me through this.
Any sort of help is highly appreciated

Thank You

[geth03]

if you read the error:

error: invalid initialization of reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from expression of type ‘double’
{ volScalarField& Xsii = Xsi[i];
^

you see that you create a reference of type volScalarField and try to reference an object of type double, which is illegal. your reference type must be the same as your referenced type.