Controlling the sign of eigenvectors with SLEPcEigenSolver()

Question

Hi,

I have a question about the eigenvalue solver 'SLEPcEigenSolver()'

For a give set of eigenvectors, will the sign be consistent?

For example, if my eigenvalues are sine waves Sin(Ax) Sin(Bx) Sin(Cx), can I be certain SLEPcEigenSolver(A,M).solve(3) will return either

{Sin(Ax) Sin(Bx) Sin(Cx)}
or
{-Sin(Ax) -Sin(Bx) -Sin(Cx)}

Or could it return a mixture of signs like

{Sin(Ax) -Sin(Bx) -Sin(Cx)}

Thanks