Question about dividerand in neural network

Hi everybody,

i have a question about the function dividerand from the neural network toolbox. It is clea that this function randomly divide the data into the three sets. But I don't know when:

• 1) only one time at the beginnig of the network training
• 2) after every passed epoche

I use batch training mode.

I hope someone can easily answer this question.

Thanks and best regards