dim                  package:limma                  R Documentation

_R_e_t_r_i_e_v_e _t_h_e _D_i_m_e_n_s_i_o_n_s _o_f _a_n _R_G_L_i_s_t, _M_A_L_i_s_t _o_r _M_A_r_r_a_y_L_M _O_b_j_e_c_t

_D_e_s_c_r_i_p_t_i_o_n:

     Retrieve the number of rows (genes) and columns (arrays) for an
     RGList, MAList or MArrayLM object.

_U_s_a_g_e:

     ## S3 method for class 'RGList':
     dim(x)
     ## S3 method for class 'RGList':
     length(x)

_A_r_g_u_m_e_n_t_s:

       x: an object of class 'RGList', 'MAList' or 'MArrayLM'

_D_e_t_a_i_l_s:

     Microarray data objects share many analogies with ordinary
     matrices in which the rows correspond to spots or genes and the
     columns to arrays. These methods allow one to extract the size of
     microarray data objects in the same way that one would do for
     ordinary matrices.

     A consequence is that row and column commands 'nrow(x)', 'ncol(x)'
     and so on also work.

_V_a_l_u_e:

     Numeric vector of length 2. The first element is the number of
     rows (genes) and the second is the number of columns (arrays).

_A_u_t_h_o_r(_s):

     Gordon Smyth

_S_e_e _A_l_s_o:

     'dim' in the base package.

     02.Classes gives an overview of data classes used in LIMMA.

_E_x_a_m_p_l_e_s:

     M <- A <- matrix(11:14,4,2)
     rownames(M) <- rownames(A) <- c("a","b","c","d")
     colnames(M) <- colnames(A) <- c("A1","A2")
     MA <- new("MAList",list(M=M,A=A))
     dim(M)
     ncol(M)
     nrow(M)
     length(M)

