sequential inputs in neural network

Hello,

I'm a beginner in neural networks and I cannot write appropriately English… sorry

I’m using signals classification with neural network.

I must train the network with many signals (about 50). Each signal has many sequences of 11 input parameters and 1 output (0 or 1). And the goal is to predict if the signal is dangerous or not.

I prepared the inputs as a cell array, and the output as a vector. The signals are independent, but I have divided the signals into a sequences, which are dependent. I have used this be able to prevent if the signal is dangerous before it ends.

So I have made the input parameters like a cell array, with this form:

P = 

      {1x9  cell}
      {1x8  cell}
      {1x7  cell}
      {1x9  cell}
      {1x11 cell}
      {1x9  cell}
      {1x8  cell}
      {1x12 cell}
      {1x9  cell}
      {1x9  cell}
      {1x7  cell}
      {1x15 cell}

And each array is like this form: [11x1 double] [11x1 double] [11x1 double] [11x1 double] [11x1 double] . . .

And the output vector is : T =

       0
       0
       0
       1
       0
       0
       1
       0
       0
       0
       1
       0

I haven’t made T as a sequence because the outputs are independent according to the signals.

So this is my code:

p = P(3:end );
t = T(3:end);

d1 = [1:2];
d2 = [1:2];

narx_net = newnarxsp(p,t,d1,d2,10);        %the problem is here

narx_net.trainFcn = 'trainbr';
narx_net.trainParam.show = 10;
narx_net.trainParam.epochs = 600;

Pi = [P(1:2); T(1:2 )];
narx_net = train(narx_net,[p;t],t,Pi );

yp = sim(narx_net,[p;t],Pi);
e = cell2mat(yp)-cell2mat(t );
plot(e)

and I had this error message:

??? Error using ==> cell2mat at 55
Cannot support cell arrays containing cell arrays or objects.

Error in ==> newnarxsp>new_5p1 at 134
if isa(p,'cell'), p = cell2mat(p); end

Error in ==> newnarxsp at 110
  net = new_5p1(varargin{:});

Error in ==> apprentissagenarx at 165
narx_net = newnarxsp(p,t,d1,d2,10);

1. I use the narx function, but I’m not really sure that it is the appropriate function. I wish to know if it is ?
2. I don’t know if the inputs and outputs should be like this ?
3. I don’t really know how to use delays appropriately

Error in ==> newnarxsp>new_5p1 at 134
if isa(p,'cell'), p = cell2mat(p); end

Error in ==> newnarxsp at 110
  net = new_5p1(varargin{:});

Error in ==> apprentissagenarx at 165
narx_net = newnarxsp(p,t,d1,d2,10);

I hope, I my problem was clear. And I will be grateful if somebody could help me.

Answer 1

[Tomaloka Chowdhury]

I am having same problem in my program.if you have solved it, can you please provide me your email address.