vegtrans               package:labdsv               R Documentation

_V_e_g_e_t_a_t_i_o_n _D_a_t_a _T_r_a_n_s_f_o_r_m_a_t_i_o_n

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

     Transforms vegetation abundances according to an arbitrary
     specified vector

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

     vegtrans(taxa,code,value)

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

    taxa: the original vegetation (or other taxon) data.frame

    code: a vector containing the set of values appearing in the
          original data.frame

   value: a vector containing the set of respective values to
          substitute

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

     Performs a respective substitution to transform specific values in
     an initial data.frame to other specified values.

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

     a data.frame of transformed vegetation

_N_o_t_e:

     Vegetation data are often collected in arbitrary abundance schemes
     (e.g. Braun-Blanquet, Domin, etc.) which have no direct algebraic 
     transformation (e.g. log).  This function transforms coded
     abundances to  arbitrary importance values as specified.

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

     David W. Roberts droberts@montana.edu <URL:
     http://ecology.msu.montana.edu/droberts>

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

     <URL: http://ecology.msu.montana.edu/labdsv/R>

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

     'decostand', 'wisconsin'

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

         data(bryceveg)
         old <- c(0.2,0.5,1.0,2.0,3.0,4.0,5.0,6.0)
         new <- c(0.2,0.5,3.0,15.0,37.5,62.5,85.0,97.5)
         newveg <- vegtrans(bryceveg,old,new)

