uniquecombs               package:mgcv               R Documentation

_f_i_n_d _t_h_e _u_n_i_q_u_e _r_o_w_s _i_n _a _m_a_t_r_i_x

_D_e_s_c_r_i_p_t_i_o_n:

     This routine returns a matrix containing all the unique rows of
     the matrix supplied as its argument. That is, all the duplicate
     rows are stripped out. Note that the ordering of the rows on exit
     is not the same as on entry.

_U_s_a_g_e:

     uniquecombs(x)

_A_r_g_u_m_e_n_t_s:

       x: is an R matrix 

_D_e_t_a_i_l_s:

     Models with more parameters than unique combinations of covariates
     are not identifiable. This routine provides a means of evaluating
     the number of unique combinations of coavariates in a model. The
     routine calls compiled C code.

_V_a_l_u_e:

     A matrix consisting of the unique rows of 'x' (in arbitrary
     order).

_A_u_t_h_o_r(_s):

     Simon N. Wood simon@stats.gla.ac.uk

_E_x_a_m_p_l_e_s:

     X<-matrix(c(1,2,3,1,2,3,4,5,6,1,3,2,4,5,6,1,1,1),6,3,byrow=TRUE)
     print(X)
     uniquecombs(X)

