How NN makes prediction

faszomat

Hi

Can anybody explain how does the NN do the prediction? Formula export is a joke of course it couldn't maka any formula. But I would like to know how does the NN prediction looks like as a forumla. Because the RapidMiner documentation hide how does this work.

For example if I got the weights of a Neural Network, how can I reprouce the same data (prediction) as the rapidminer does.