initializeLMatPtrs Subroutine

    subroutine initializeLMatPtrs()
        integer :: nBI

        nBI = numBasisIndices(nBasis)
        ! some typical array dimensions useful in the indexing functions
        strideInner = fuse_symm_idx(nBI, nBI)
        strideOuter = strideInner**2

        if(allocated(lMat)) deallocate(lMat)
        if (tSparseLMat) then
            allocate(sparse_lMat_t :: lMat)
        else
            allocate(dense_lMat_t :: lMat)
        end if
        ! set the LMatInd function pointer
        if (t12FoldSym) then
            lMat%indexFunc => oldLMatInd
        else if (tSymBrokenLMat) then
            ! also need to set the size of the blocks
            lMat%indexFunc => lMatIndSymBroken
        else
            lMat%indexFunc => lMatIndSym
        end if

    end subroutine initializeLMatPtrs