extern a saved-loaded neural network with new input

Hello All!

I would like to ask, that how is it possible, to add a new input to a saved, and loaded narxnet neural network. I can load the network that I previously saved from workspace, with net=load('mynet','-mat'); net=net.netm (netm was the variable name in the function what produced the workspace variable, and mynet is the name of the saved file) I can also use the network after loading it this way (I can use new test data to process with it, etc.), but I would like to add an additional input (and weights) to the network. I don't want to generate a new network which contains also the new input vectors, because the initialization was random, and I cannot generate a new network that would have as good performance, as the saved one. So I would like to extern my "good old" network with new input vectors.

Thank you in advance for your help!