problems with training function LVQ (example from help does not work)

Hi all, please I need your help !

example (LVQ) from help does not work

P = [-3 -2 -2 0 0 0 0 2 2 3; 0 1 -1 2 1 -1 -2 1 -1 0];

Tc = [1 1 1 2 2 2 2 1 1 1];

T = ind2vec(Tc);

targets = full(T);

net = newlvq(P,4,[.6 .4]);

Y = sim(net,P);

Yc = vec2ind(Y);

net.trainParam.epochs = 150;

net = train(net,P,T);

In training process after 2 interactions training was stop. (My system 2011a,a check on 2009b - the same thing).

Maybe I'm doing something wrong?

Answer 1

[Greg Heath]

Nothing is wrong...it is a simple problem that only requires 2 or 3 epochs to obtain 0 error. You just didn't follow through.

close all, clear all, clc

% NOTE: Remove end semicolons to monitor outputs

P = [-3 -2 -2 0 0 0 0 2 2 3; 0 1 -1 2 1 -1 -2 1 -1 0]
Tc      = [1 1 1 2 2 2 2 1 1 1]
T       = ind2vec(Tc)
targets = full(T)

net = newlvq(minmax(P),4,[.6 .4]); % Old Version

% With no training
IW = net.IW{1,1}
LW = net.LW{2,1}
b  = net.b(1,:)
Y = sim(net,P)
Yc = vec2ind(Y)
% ... Yc = [ 1 1 1 1 1 1 1 1 1 1 ]
% resulting in a classification error of 40%

%Training with defaults
net = train(net,P,T);
% Converges in 3 epochs
IW = net.IW{1,1}
LW = net.LW{2,1}
b  = net.b(1,:)
Y = sim(net,P)
Yc = vec2ind(Y)
% ... Yc = [ 1 1 1 2 2 2 2 1 1 1 ]
% resulting in a classification error of 0% !!!

Hope this helps.

Greg

Answer 2

[Greg Heath]

Sorry for the formatting. This text editor sucks.

Greg

[Walter Roberson]

Put a newline before the code to be formatted. Highlight the code to be formatted. Click on the "{} Code" button. Code will now be formatted in the preview.