splitQual                package:NADA                R Documentation

_S_p_l_i_t _c_h_a_r_a_c_t_e_r _q_u_a_l_i_f_i_e_r_s _a_n_d _n_u_m_e_r_i_c _v_a_l_u_e_s _f_r_o_m _q_u_a_l_i_f_i_e_d _d_a_t_a

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

     'splitQual' extracts qualified and unqualified vectors  from a
     character vector containing concatenated  numeric and qualifying
     characters.

     Typically used to split ``less-thans" in qualifier-numeric 
     concatenations like ``<0.5".

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

      splitQual(v, qual.symbol= "<") 

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

       v: A character vector. 

qual.symbol: The qualifier symbol to split from the characters in v.
          Defaults to ``<". 

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

     'splitQual' returns a list of three vectors.

    qual: A numeric vector of values associated with qualified input. 

  unqual: A numeric vector of values associated with unqualified input  

qual.index: Indexes of qualified values (ie., where qual.symbol was
          matched) 

unqual.index: Indexes of unqualified values (ie., where qual.symbol was
          not matched) 

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

     Lopaka(Rob) Lee <rclee@usgs.gov>

     Dennis Helsel <dhelsel@usgs.gov>

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

     Lee and Helsel (2005), Statistical analysis of environmental data
     containing multiple detection limits: S-language software for
     regression on order statistics, Computers in Geoscience vol. 31,
     pp. 1241-1248

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

         v = c('<1', 1, '<1', 1, 2)
         splitQual(v)

