You might observe this actions in most strategies which have been depending on neighborhood graphs. Isomap/LLE/Laplacian Eigenmaps/LTSA can only embed knowledge that provides rise into a linked neighborhood graph. In case the neighborhood graph will not be related, the implementations only embed the largest related component with the neighborhood http://engineeringprojecthelp51516.dbblog.net/15042256/5-easy-facts-about-simulink-matlab-help-described