Scheme of plug in functions call

The figure below shows a scheme of function calls in nsgportal. In the plug-in there are two main sets, or layers, of functions designated by the prefix pop_ and nsg_. The pop_ functions open a parameter entry window when called with fewer than the required arguments, else run directly without opening a window. The second class of nsgportal functions with prefix nsg_ can be called directly from MATLAB command line or from other MATLAB scripts or functions. These functions perform lower-level processing than the pop_ functions. A plug-in function (eegplugin_nsgportal) manages the inclusion and appearance of an nsgportal item in the main EEGLAB window menu.