There is NO such library, because those are not legal function names in MATLAB. A dash is not legal in a name, in a function OR in a variable. MATLAB will try to interpret that as a subtraction of two terms, and then look for functions or variables named h and plane, wanting to subtract one from the other.
Perhaps you were told to use functions with an underscore in the name, thus h_plane and e_plane. This is a not uncommon way to name functions or variables. However...
But as you see, those are not functions that any toolbox in MATLAB provides, and they are not part of MATLAB itself.
So it is possible they are part of some toolbox that your teacher provides, or a colleague. In that case, talk to them.