For MATLAB tutorial, many can be found by google search for "matlab tutorial"
Free version of Matlab look-a-like called Octave available here or at Octave.org. Octave is not totally compatible, and the software listed below may or may not run.
.m files
pre-multiply convention
post-multiply convention
pre and post conventions combined
data (post convention)
curves
surfaces and patches
midterm exam solution
Matlab code from ELEC 350 to simulate AM and FM signals