Contents
Description of demo_unsupervised_MDS_Sammon.m
Demonstrates classic Multi-Dimensional Scaling and Sammon mapping
clear all close all load cities.mat Xtrain = ratings;
usage of MDS
MDS projection to 2D
options = struct('nComponents',2); Xreduced = ml_visualize_MDS(Xtrain,options); plot(Xreduced(:,1),Xreduced(:,2),'.'); grid on grid minor title('MDS 2-dimensional visualization of cities data'); fprintf('Click plot to name cities, press any key to continue\n'); gname(names) % 3D projection of dataset using MDS options = struct('nComponents',3); Xreduced = ml_visualize_MDS(Xtrain,options); plot3(Xreduced(:,1),Xreduced(:,2),Xreduced(:,3),'.'); grid on grid minor
Click plot to name cities, press any key to continue
usage of Sammon mapping
Sammon mapping projection to 2D
options = struct('nComponents',2); Xreduced = ml_visualize_Sammon(Xtrain,options); plot(Xreduced(:,1),Xreduced(:,2),'.'); grid on grid minor title('Sammon mapping 2-dimensional visualization of cities data'); fprintf('Click plot to name cities, press any key to continue\n'); gname(names) % Sammon mapping projection to 3D options = struct('nComponents',3); Xreduced = ml_visualize_Sammon(Xtrain,options); plot3(Xreduced(:,1),Xreduced(:,2),Xreduced(:,3),'.'); grid on grid minor
Click plot to name cities, press any key to continue
