// TODO: vectors must be contiguous in memory and mine aren't
    assert(group.vectorlength == 1);

      scalargroupdata.data.at(tl).at(0) = new CCTK_REAL[scalargroupdata.numvars];

        scalargroupdata.data.at(tl).at(vi) = new CCTK_REAL;

        scalargroupdata.data.at(tl).at(vi) = scalargroupdata.data.at(tl).at(0) + vi;