Memory usage for neural network

Hi! I am using a Matlab toolbox (nftool) to solve a regression problem. In particolar, I am comparing the performances using different training algorithms. For example, Levenberg-Marquardt algorithm requires more memory due to Jacobians calculations. But how can I compute precisely the amount of memory used to train my NN? Is there any Matlab command that can help me to compute it, depending on my data, inputs, weights, outputs.. ? Thanks!