Hello, with the latest Matlab version 2019b, you are availed with a wide range of functions that can do this job for you. With my program for neural network modeling, i added some lines of code that also plot the best neural network. You can start by checking out the "line" and "viscircles" functions in the Matlab documentation. These can help you with what you want to plot. Below is a sample plot output from my code, of the best network i was designing. With added work, you can modify the lines to visualize the magnitude and direction of the weights, remove the axis bars, and many other things that you would like to do.