Kohonen (example from help does not work)

Hi all, please I need your help !

example (Kohonen) from help does not work

>> p = [.1 .8 .1 .9; .2 .9 .1 .8];

>> net = newc([0 1; 0 1],2);

>> wts = net.IW{1,1}

>> biases = net.b{1};

>> net.trainParam.epochs = 500;

>> net = train(net,p);

>> a = sim(net,p);

>> ac = vec2ind(a); >> ac

ac =

     1     1     1     1

>> wts

wts =

    0.5000    0.5000
    0.5000    0.5000

My weight did not change. in example

wts =

    0.1000    0.1467
    0.8474    0.8525

Maybe I'm doing something wrong?

Answer 1

[Alexander]

7.10.0 (R.2010b)

[Lucas García]

So, download the fix in the previous link and give it a try. Then it will work fine.

Answer 2

[Walter Roberson]

You did not assign a new value to wts, so it is going to continue to be the value that was retrieved before you did the training. You need to retrieve net.IW{1,1} after the training in order to see the effect of the training on the weights.

[Alexander]

These are my values after training

net.IW{1,1}

ans =

0.5000 0.5000

0.5000 0.5000

After training, they have not changed.

Answer 3

[Lucas García]

Which release are you using? There is a known bug in R2010b and R2011a regarding newc and competlayer.

http://www.mathworks.com/support/bugreports/730788

It has been fixed in R2011b.

[Alexander]

Thanks Men. You saved my life !!! :)))

Answer 4

[Alexander]

It is strange, but FIX_R2010b_COMPETLAYERAYER.zip is corrupted.

FIX_R2011a_COMPETLAYER.zip is normal.