FilterPDE needs to include the fullToReduced and reducedToFull capability of BCs. For Neumann problem the result it's the same, but this is not the case for periodic problems. In the current master the fullToReduced and reducedToFull lines have been commented
FilterPDE needs to include the fullToReduced and reducedToFull capability of BCs. For Neumann problem the result it's the same, but this is not the case for periodic problems. In the current master the fullToReduced and reducedToFull lines have been commented