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- function highlight(A,xy,sep)
- %HIGHLIGHT Plot a mesh with subgraph highlighted.
- % highlight(A,xy,sep) plots a picture of the mesh A with
- % coordinates xy, highlighting the subgraph induced
- % by the vertices in sep.
-
- % Copyright (c) 1984-93 by The MathWorks, Inc.
-
- [n,n] = size(A);
- [i,j] = find(A);
-
- % Plot main graph with vertices before edges.
-
- [ignore, p] = sort(max(i,j));
- i = i(p);
- j = j(p);
- X = [ xy(i,1) xy(j,1) NaN*ones(size(i))]';
- Y = [ xy(i,2) xy(j,2) NaN*ones(size(i))]';
- d = 'r-';
- xymin = min(xy);
- xymax = max(xy);
- range = max(xymax-xymin);
- plot (X(:), Y(:), d);
- axis([xymin(1) xymin(1)+range xymin(2) xymin(2)+range]);
- axis('square');
- hold on;
-
- % Highlight sep set.
-
- B = A(sep,sep);
- xB = xy(sep,1);
- yB = xy(sep,2);
- [i,j] = find(B);
- X = [xB(i) xB(j) NaN*ones(size(i))]';
- Y = [yB(i) yB(j) NaN*ones(size(i))]';
- plot (X(:), Y(:), 'w-');
- if n < 1200
- plot(xB,yB,'wo');
- else
- plot(xB,yB,'w.');
- end
-
- hold off;
-