%PLOTM Plot mapping values, contours or surface% % 	H = PLOTM(W,S,N)%% INPUT%   W   Trained mapping%   S   Plot strings, or scalar selecting type of plot %         (1: density plot;%          2: contour plot (default); %          3: 3D surface plot; %          4: 3D surface plot above 2D contour plot; %          5; 3D mesh plot;%          6: 3D mesh plot above 2D contour plot)%   N   Contour level(s) to plot %         (default: 10 contours between minimum and maximum)%% OUTPUT%		H		Array of graphics handles%% DESCRIPTION% This routine, similar to PLOTC, plots contours (not just decision% boundaries) of the mapping W on predefined axis, typically generated by% SCATTERD. Plotstrings may be set in S. The vector N selects the contour.% % EXAMPLES% See PREX_DENSITY%% SEE ALSO% MAPPINGS, SCATTERD, PLOTC% Copyright: R.P.W. Duin, r.p.w.duin@prtools.org% Faculty EWI, Delft University of Technology% P.O. Box 5031, 2600 GA Delft, The Netherlands% $Id: plotm.m,v 1.21 2006/10/23 14:46:51 davidt Exp $function handle = plotm(w,arg2,n,cnd)	prtrace(mfilename);      	ismapping(w);				% Assert that W is a mapping.	% Get the parameters, the plotstrings and the number of contours.    if (nargin < 4)        cnd = 1;    end;       	[k,c] = size(w);	if (k>2)		error('Plotting the mapping is only possible for 2D datasets.');	end	if (nargin < 3)		n = []; 	end	plottype = 2; s = []; 	if (nargin >= 2)		if (~isstr(arg2) & ~isempty(arg2))			plottype = arg2; 		else			s = arg2;		end	end	if (nargin < 2) | (isempty(s)) 		col = 'brmk'; 		s = [col' repmat('-',4,1)];		s = char(s,[col' repmat('--',4,1)]);		s = char(s,[col' repmat('-.',4,1)]);		s = char(s,[col' repmat(':',4,1)]);		s = char(s,s,s,s);	end	% When one contour should be plotted, two entries have to be given in	% the contour plot (Matlab bug/feature).	%if (~isempty(n)) & (length(n) == 1), n = [n n]; end		% Setup the mesh-grid, use the axis of the currently active figure.	% Note: this will be a 0-1 grid in case of no given scatterplot.		hold on; V = axis; 	gs = gridsize; dx = (V(2)-V(1))/gs; dy = (V(4)-V(3))/gs;    if (plottype == 1)			m = (gs+1); X = (V(1):dx:V(2))';			D = double([X,zeros(m,k-1)]*w);    else			m = (gs+1)*(gs+1); [X Y] = meshgrid(V(1):dx:V(2),V(3):dy:V(4));	    D = double([X(:),Y(:),zeros(m,k-2)]*w);    end;    if (~cnd)        D = sum(D,2);    end;    	% HH will contain all handles to graphics created in this routine.	hh = [];    % Plot the densities in case of 1D output.    if (plottype == 1)        for j = 1:size(D,2)            if (size(s,1) > 1), ss = s(j,:); else, ss = s; end            % Plot the densities and add the handles to HH.    		h = plot([V(1):dx:V(2)],D(:,j),deblank(ss));    		hh = [hh; h];        end            axis ([V(1) V(2) 0 1.2*max(max(D))]);				ylabel('Density')    end    	% Plot the contours in case of 2D output.	if (plottype == 2) | (plottype == 4) | (plottype == 6)		% Define the contour-heights if they are not given.		if (isempty(n)), n = 10; end				dmax = max(D(:)); dmin = min(D(:)); dd = (dmax-dmin)/(n+1);		n = [dmin+dd:dd:dmax-dd];		if length(n) == 1, n = [n n]; end		% Plot the contours for each of the classes.	   		for j = 1:size(D,2)   			if (size(s,1) > 1), ss = s(j,:); else, ss = s; end   			Z = reshape(D(:,j),gs+1,gs+1);			% Plot the contours and add the handles to HH.   			[cc, h] = contour([V(1):dx:V(2)],[V(3):dy:V(4)],Z,n,deblank(ss));   			hh = [hh; h];			        end        		view(2);	end	% Plot the surface in case of 3D output.	if (plottype == 3) | (plottype == 4) | (plottype == 5) | (plottype == 6)		% Scale the outputs to cover the whole colour range.		%E = D - min(D(:));		%E = 255*E/max(E(:))+1;        E = D; % Scaling appears disputable (RD)		if (c>1)        Z = reshape(sum(E,2),gs+1,gs+1);	  else        Z = reshape(E(:,1),gs+1,gs+1);	  end 		if (plottype == 4) | (plottype == 6)				Z = Z + max(max(Z));		end;		% Plot the surface, set up lighting and add the handles to HH.		h = surf([V(1):dx:V(2)],[V(3):dy:V(4)],Z);		if (plottype == 3) | (plottype == 4)            colormap jet;            shading interp;			set(h,'FaceColor','interp','EdgeColor','none','FaceLighting','phong');		else			colormap white;			shading faceted;		end		view(-37.5,20);		camlight left; 								% Necessary to solve camlight bug?		camlight headlight;		camlight right;		hh = [hh; h];	end	hold off; if (nargout > 0), handle = hh; endreturn