feedback             package:LoopAnalyst             R Documentation

_F_e_e_d_b_a_c_k _o_f _a _P_a_r_t_i_a_l_l_y _S_p_e_c_i_f_i_e_d _S_y_s_t_e_m

_D_e_s_c_r_i_p_t_i_o_n:

     Computes the qualitative feedback of a partially specified system;
     where _qualitative_ means direction: increases, decreases, no
     change, or ambiguous.

_U_s_a_g_e:

     feedback(C)

_A_r_g_u_m_e_n_t_s:

       C: A (-1, 0 1) square matrix.

_D_e_t_a_i_l_s:

     The supplied matrix is validated as a square (-1, 0, 1) matrix,
     and the sign-corrected product of system-spanning sets of disjunct
     loops is summed over all levels of feedback, and the result
     returned.  Ambiguous results are returned as 'NA'.

_V_a_l_u_e:

     -1, 0, 1, or 'NA'

_A_u_t_h_o_r(_s):

     Alexis Dinno <URL: http://www.doyenne.com/LoopAnalyst/>

_R_e_f_e_r_e_n_c_e_s:

     Puccia, C. J. and Levins, R. (1986) _Qualitative Modeling of
     Complex Systems: An Introduction to Loop Analysis and Time
     Averaging_. Cambridge: Harvard University Press.

_S_e_e _A_l_s_o:

     'make.cm'.

_E_x_a_m_p_l_e_s:

     ## compute the feedback of a system
     data(submatrix)
     feedback(submatrix)

