Question
I trained my neural network, but it generates negative values even though the target values are positive. I wonder why ?
Expert Answer
John Williams
PhD Expert
Answered Nov 20, 2025
the output of the neural network depends on the transfer function of the output layer, if the results are negative you probably have a transfer function like "tansig" or "purelin", I recommend that if you don't want negative values you should change the transfer function, if the answer is in the range from 0 to 1 you can change it to "logsig" or whatever function you desire :
net.Layers{end}.transferFcn='logsig';
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