function  contour_qp_flux_component (i_p)
Pts_wide=2;
% Copyright 2000, J.E. Akin.  All rights reserved.
% plot element Gauss point flux i_p magnitude as a surface 
% convert any type of mesh to a structured square mesh

% x,y   ==  nodal coordinates of the FEA
% f     ==  nodal solution of the FEA
% X,Y   ==  nodal coordinates of the structured square mesh
% F     ==  interpolated solution for the structured square mesh
% NX    ==  number of nodes in x-direction for structured mesh 
% NY    ==  number of nodes in y-direction for structured mesh

if ( nargin == 0 )
  i_p = 0 ;
end % if no arguments

load el_qp_xyz_fluxes.tmp; % x,y followed by flux list
np = size (el_qp_xyz_fluxes, 1) ;     % count points
nf = size (el_qp_xyz_fluxes, 2) - 2;  % count components
if ( np == 0 )
  error ('Error missing file el_qp_xyz_fluxes.tmp')
end % if error
if ( nf <= 0 )
  error ('Error, no fluxes in file el_qp_xyz_fluxes.tmp')
end % if error

% NX, NY = 31 are default values, these can be altered by user
NX = 41; NY = 41;

x = el_qp_xyz_fluxes (:, 1);
y = el_qp_xyz_fluxes (:, 2);
 
if ( i_p > 0 )
  f =  el_qp_xyz_fluxes (:, (i_p + 2)) ;
else
  for j = 1:np
    f(j) = sqrt ( sum(el_qp_xyz_fluxes (j, 3:(nf+2)).^2) ) ;
  end % for np points
end % which component

xlin = linspace (min(x), max(x), NX);
ylin = linspace (min(y), max(y), NY);
[X, Y] = meshgrid (xlin, ylin);
F = griddata (x, y, f, X, Y, 'cubic');

clf
c = contour (X,Y,F,'LineWidth',Pts_wide);
clabel (c);
hold on
grid
xlabel (['X: ', int2str(np),' Nodes'])
ylabel ('Y');
if ( i_p > 0 )
  title (['Matlab Smoothed FEA QP Flux Component\_', int2str(i_p), ...
          ': at ', int2str(np), ' Gauss Points']);
else
  title (['Matlab Smoothed FEA QP Flux RMS Value at ', ...
          int2str(np), ' Gauss Points'])
end % which component
%       -depsc -tiff            % for an eps version
  %bprint ('-dpsc', ['contour_qp_flux_component_', int2str(i_p)])
  hold off
  %bv_text = ['Created contour_qp_flux_component_', int2str(i_p), '.ps'];
  %bfprintf (1,'%s', v_text) ; fprintf (1, ' \n' )

% end of contour_qp_flux_component