initiator_criterium Function

    function initiator_criterium(sign, hdiag, run) result(init_flag)
        real(dp), intent(in) :: sign(lenof_sign), hdiag
        integer, intent(in) :: run
        ! variance of sign and either a single value or an aggregate
        real(dp) :: sigma, tot_sgn
        integer :: crun, nOcc
        real(dp) :: scaledInitiatorWalkNo
        logical :: init_flag
#ifdef CMPLX_
        unused_var(run)
#endif

        if (tEScaleWalkers) then
            scaledInitiatorWalkNo = InitiatorWalkNo * scaleFunction(hdiag)
        else
            scaledInitiatorWalkNo = InitiatorWalkNo
        end if
        ! option to use the average population instead of the local one
        ! for purpose of initiator threshold
        if (tGlobalInitFlag) then
            ! we can use a signed or unsigned sum
            if (tSignedRepAv) then
                tot_sgn = real(abs(sum(sign)), dp) / inum_runs
            else
                tot_sgn = av_pop(sign)
            end if
        else
            tot_sgn = mag_of_run(sign, run)
        end if
        ! make it an initiator
        init_flag = tot_sgn > scaledInitiatorWalkNo &
                     .or. (tTruncInitHalf .and. (sign(run) > 0.0_dp))
    end function initiator_criterium