positiveDefinite         package:fUtilities         R Documentation

_P_o_s_i_t_i_v_e _D_e_f_i_n_i_t_e _M_a_t_r_i_x_e_s

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

     Checks if a matrix is positive definite and/or forces a matrix to
     be positive definite.

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

     isPositiveDefinite(x)
     makePositiveDefinite(x)

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

       x: a square numeric matrix. 

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

     The function 'isPositiveDefinite' checks if a square  matrix is
     positive definite.

     The function 'makePositiveDefinite' forces  a matrix to be
     positive definite.

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

     Korbinian Strimmer.

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

     ## isPositiveDefinite - 
        # the 3x3 Pascal Matrix is positive define 
        isPositiveDefinite(pascal(3))                

