DEMO_GRNN_2D Example of 2D GRNN regression Example showing basic use of grnntra/grnnsim for 2D function approximation: - create 300 2D training points - compute their elevation according to a known nonlinear model - get a regular grid of test points on a square 2D domain - train the model using the training data - predict the elevation on the test data using the trained model - plot the results (use rotate 3D in the figure to see this better)