m files for loading avi, raster, calculating A

1st week 5/19-5/23
order of operation: A_components.m, calls to calc_A_higher.m, calls to
calc_X.m, calls to avi_to_raster.m, calls to read_avi.m

note, calc_A.m computes A for only order of 1, practice
calc_A_higher.m computes for user input order

Each .m file has a small header which can be expanded, or steps can be
commented if necessary. I apologize if my variables/files are named
strangely, or if some things I included are unnecessary (user input,
text output, etc.). Let me know if you'd prefer something else