wrappers                package:geoR                R Documentation

_W_r_a_p_p_e_r_s _f_o_r _t_h_e _C _f_u_n_c_t_i_o_n_s _u_s_e_d _i_n _g_e_o_R

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

     These functions are _wrappers_ for some (but not all) the C
     functions included in the 'geoR' package.
      Typically the C code is directly  called from the 'geoR'
     functions but these functions allows independent calls.

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

     diffpairs(coords, data)
     loccoords(coords, locations)
     .diagquadraticformXAX(X, lowerA, diagA) 
     .bilinearformXAY(X, lowerA, diagA, Y) 
     .corr.diaglowertri(coords, cov.model, phi, kappa)
     .Ccor.spatial(x, phi, kappa, cov.model)

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

  coords: an n x 2 matrix with the data coordinates.  

    data: an vector with the data values.  

locations: an N x 2 matrix with the coordinates of the prediction
          locations. 

  lowerA: a vector with the diagonal terms of the symmetric matrix  A. 

   diagA: a vector with the diagonal terms of the symmetric matrix A. 

       X: a matrix with conforming dimensions. 

       Y: a matrix with conforming dimensions. 

cov.model: covariance model, see 'cov.spatial' for options and more
          details.  

     phi: numerical value of the correlation function parameter phi.

   kappa: numerical value of the correlation function parameter kappa.

       x: a vector of distances.  

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

     The outputs for the different functions are: 

diffpairs: returns a list with elements 'dist' - the distance between
          pairs of points, and 'diff' - the difference between the
          values of the attributes.  

loccoords: returns a n x N  matrix with distances between data points
          and prediction locations.  

diagquadraticformXAX: returns a vector with the diagonal term of the
          quadratic form t(X) %*% A %*% X.  

bilinearformXAY: returns a vector or a matrix with the terms of the
          quadratic form t(X) %*% A %*% Y.  

corr.diaglowertri: returns the lower triangle of the correlation
          matrix, including the diagonal.  

Ccor.spatial: returns a vector of values of spatial correlations.  

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

     Paulo Justiniano Ribeiro Jr. paulojus@leg.ufpr.br, 
      Peter J. Diggle p.diggle@lancaster.ac.uk.

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

     Further information on the package 'geoR' can be found at:
      <URL: http://www.leg.ufpr.br/geoR>.

