[SOLVED] having trouble with neural networks

[sadatwins]

can you please help me.:-o
my problem is that every time i run my code performance varies (i mean accuracy of classification change)i'm using neural network for P300 Classification.
i train my neural network with 3 sessions and i use 4th sessions to test neural network.

here is my matlab code

P=x2;
Tg=y;
net=newff(P,Tg,5 );
[net,tr]=train(net,P,Tg);

and to test my data:
y=sim(net,x2);

here is performance figures(i got them by comparing how many of test data were classified correctly):

 

[AILab]

Hi, it is the normal the accuracy of recognition using NNs will change for every execution, because NNs use random weight adjustment. So u need to take may be several results and average it.

 

[iVenky]

How many classes do you have? I believe if you increase the no of inputs then you will get better results.