itsArith                 package:its                 R Documentation

_A_r_i_t_h_m_e_t_i_c _M_e_t_h_o_d_s _f_o_r _I_r_r_e_g_u_l_a_r _T_i_m_e-_S_e_r_i_e_s _O_b_j_e_c_t_s

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

     Arithmetic methods for objects of class '"its"'.

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

          x + y
          x - y
          x * y
          x / y
          x ^ y
          x 
          x 

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

     x,y: an object of class '"its"'

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

     The arithmetic operators return numeric vectors containing the
     result of the  element-by-element operations.  The arguments must
     be conformable (same dimensions)  and their time-stamps must match
     for each row.

     Note that the matrix multiplication operator,  and the result of a
     matrix multiplication is a matrix, not an '"its"'. The resulting
     matrix can be converted back to its using the function its()  -
     see examples.

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

     The returned object is an object of class '"its"', conformable
     with the inputs, and with identical time-stamps.

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

     Giles Heywood

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

     'ts', 'POSIXct', 'itsFile', 'itsLags' 'itsJoin' 'itsTimes'
     'itsSubset' 'itsFin' 'itsDisp' 'itsInfo' 'itsCumdif'

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

     b <- newIts(1:30,ncol=3)
     b+b-2*b
     b/b
     b%*%diag(ncol(b))
     its(b%*%diag(ncol(b))) 

