aRTquerier                package:aRT                R Documentation

_C_l_a_s_s _a_R_T_q_u_e_r_i_e_r

_D_e_s_c_r_i_p_t_i_o_n:

     Class that manipulates the result of a query in a database. It
     returns the objects one by one, and can slide a temporal aRTtheme.
     This class is different from the others because it does not store
     anything in the database.

_O_b_j_e_c_t_s _f_r_o_m _t_h_e _C_l_a_s_s:

     'obj = new("aRTquerier", parent,... )' Objects can be created by
     calls of the form 'openQuerier(parent, loadgeom=T, loadatt=T)', or
     'openQuerier(theme, chronon="hourofday")'.

_A_r_g_u_m_e_n_t_s:

     _p_a_r_e_n_t: Object of class {'aRTlayer','aRTtheme'}

     _l_o_a_d_g_e_o_m: Will geometry be retrieved?

     _l_o_a_d_a_t_t: Will attributes be retrieved?

     _c_h_r_o_n_o_n: A temporal slicing.

     _t_a_b_l_e: (not implemented)

     _a_t_t: (not implemented)

     _s_t_a_t: (not implemented)

_C_h_r_o_n_o_n:

        *  nochronon

        *  second

        *  minute

        *  hour

        *  day

        *  month

        *  year

        *  dayofweek

        *  dayofmonth

        *  dayofyear

        *  monthofyear

        *  season

        *  weekofyear

        *  hourofday

        *  minuteofhour

        *  secondofminute

_S_t_a_t:

        *  nostat

        *  sum

        *  max

        *  min

        *  count

        *  validcount

        *  stddev

        *  kernek

        *  mean

        *  variance

        *  skewness

        *  kurtosis

        *  median

        *  varcoeff

        *  mode

_E_x_t_e_n_d_s:

     Class 'aRTcomponent', directly.

_M_e_t_h_o_d_s:

     _g_e_t_D_a_t_a: Returns the next element of the query result in the
          actual slide.

     _n_e_x_t_S_l_i_d_e: Loads the next slide, if there is a temporal sliding. A
          temporal query needs to load one slide before using 'getData'
          for getting its elements. Non-temporal queries can't use this
          function. Note that you can do a non-temporal query in a
          temporal layer.

_A_u_t_h_o_r(_s):

     Pedro Ribeiro de Andrade Neto

