nan as NARXNET output! what's thats means?

Dear friends

I worked on a time series predictor by NARXNET based on http://nl.mathworks.com/help/nnet/ug/design-time-series-narx-feedback-neural-networks.html input size: 1265 * 10 output size: 1265 * 1

so after execution I say that in some of NARXNET output were nan what is this means and what is the cause of it?

Answer 1

[Greg Heath]

There is at least one error in your code.

Greg