newff vs newlin

[alon.benari]

Hello, 
I am a newbie to octave learning neural network. Using  nnet octave package
I work through the examples in a MATLAB book. 
I have the following results from MATLAB:
net=newlin([1 3;1 3],1);

>> net.IW{1,1}=[1 2];
>> net.b{1}=0;
P=[1 2 2 3;2 1 3 1];
>> net.IW{1,1}=[1 2];
>> net.b{1}=0;
A=sim(net,P)

A =

     5     4     8     5
>From octave 
If  I am correct we are looking at one layer with with output so
net=newff([1 3;1 3],[1 1])
 net.IW{1,1}=[1 2];
 net.b{1}=0;
The P input  is the same.
but the sim output is not.
If someone can please point to my error?


Thaks
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