constant                 package:rv                 R Documentation

_C_o_n_s_t_a_n_t _V_e_c_t_o_r_s

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

     Tests or coerces objects that are non-random.

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

      is.constant(x)
      ## S3 method for class 'rv':
      is.constant(x)
      ## Default S3 method:
      is.constant(x)
      ## S3 method for class 'rvsim':
      is.constant(x)
      as.constant(x)
      ## S3 method for class 'rvsim':
      as.constant(x)
      ## S3 method for class 'rv':
      as.constant(x)

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

       x: an object, random variable (rv) or not

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

     'is.constant' returns 'TRUE' for each component of the argument
     object if the implied variance (sample variance of the
     simulations) is zero or if there is only one simulation (that is,
     the variable is ``constant").

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

     Jouni Kerman kerman@stat.columbia.edu <URL:
     http://www.stat.columbia.edu/~kerman>

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

     Kerman, Jouni and Gelman, Andrew. Manipulating and Summarizing
     Posterior Simulations Using Random Variable Objects. Technical
     report, Columbia University, New York.

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

       is.constant(1)         # TRUE
       is.constant(rvnorm(1)) # FALSE

