demo2.m

流形学习中的重要方法MVU的源代码

tt=color; 
try
fprintf('Computing distances...');
Dis=distance(X); 
fprintf('done\n');
catch
error('ERROR! Are you sure distance.m is in the path?');
end;
 
subplot(2,1,1);
scatter3(X(1,:),X(2,:),X(3,:),5,tt,'filled'); axis equal;
title('Original');
drawnow; 
try
pars.solver=0;
[Y,D]=mvu(Dis,3,pars); % CSDP 
fprintf('\n\nCSDP is working!\n');
catch
pars.solver=1;
[Y,D]=mvu(Dis,3,pars); % SEDUMI 
fprintf('\n\nCSDP does not seem to be installed correctly.\n');
fprintf('SeDuMi is working!\n');
end;
subplot(2,1,2);
scatter(Y(1,:),Y(2,:),5,tt,'filled'); axis equal;
title('Reduced Dimensionality');