neural network problem, denormalize and new data simulate

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hello, I have a question, I created my neural network and using this equation I could take her to EXCEL:

Y = B2 + LW * tanh (B1 + IW * X);

But how I can denormalize the output? and how should I standardize the new data you want to incorporate into this equation?

To explain better, when I put approves my neural network with other data, let's say "sample data", as I normalize, I surguen many problems the mapminmax equation MATLAB, as I have maximum and minimum values, but if I have only an input which would be the maximum and minimum.

And yet I can not denormalize the output of the neural network.

Please help me.

XOXO