attr                  package:base                  R Documentation

_O_b_j_e_c_t _A_t_t_r_i_b_u_t_e_s

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

     Get or set specific attributes of an object.

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

     attr(x, which)
     attr(x, which) <- value

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

       x: an object whose attributes are to be accessed.

   which: a character string specifying which attribute is to be
          accessed.

   value: an object, the new value of the attribute.

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

     These functions provide access to a single attribute of an object.
      The first form returns the value of the named attribute.  The
     replacement form causes the named attribute to take the value
     specified.

     The first form first looks for an exact match to 'which' amongst
     the attributes of 'x', then a partial match.  If no exact match is
     found and more than one partial match is found, the result is
     'NULL'.

     Note that some attributes (namely 'class', 'comment', 'dim',
     'dimnames', 'names' and 'tsp') are treated specially and have
     restrictions on the values which can be set.

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

     Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) _The New S
     Language_. Wadsworth & Brooks/Cole.

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

     'attributes'

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

     # create a 2 by 5 matrix
     x <- 1:10
     attr(x,"dim") <- c(2, 5)

