They've had the mupad notebook (http://www.mathworks.com/help/symbolic/mupad.html) ever since they replaced the backend of symbolic math toolbox from maple to mupad, around 2008 or 2009. But I don't think it's too popular with Matlab users, there's a certain simplicity to just having a plot come up in a new standalone window that can actually be surprisingly hard to accomplish cross platform. Often have to pick your poison of depending on Tk, Gtk, Qt, Electron, or running in a browser (which still doesn't feel right to a lot of people, and for the non-Python languages supported by jupyter the Python server backend is a non-trivial dependency that can be messy to deal with).