length                package:arules                R Documentation

_G_e_t_t_i_n_g _t_h_e _N_u_m_b_e_r _o_f _E_l_e_m_e_n_t_s

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

     S4 methods for 'length' which return the number of elements of
     objects defined in the package 'arules'.

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

     ## S4 method for signature 'rules':
     length(x)
     ## S4 method for signature 'itemsets':
     length(x)
     ## S4 method for signature 'itemMatrix':
     length(x)

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

       x: an object of class  'transactions', 'rules', 'itemsets',
          'tidList', or 'itemMatrix'. 

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

     For 'itemMatrix' and 'transactions' the length is defined as the
     number of rows (transactions) in the binary incidence matrix.

     For sets of associations ('rules', 'itemsets' and 'associations'
     in general) the length is defined as the number of elements in the
     set (i.e., the number of rules or itemsets).

     For 'tidList' the length is the number of elements in the object
     (a transaction ID list belongs to a set of itemsets and contains
     for each itemset in the set one list element containing several
     transaction IDs).

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

     An 'integer' giving the "length" of 'x'.

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

     Michael Hahsler

