Hello,
rrefview and rrefquik are functions discussed in lab 4 but students 
don't need to use these for the homework in matlab sections 4.2 and 
4.3.  The matlab files found on the 265 course webpage do not contain 
all the functions discussed in the manual, but they can be found here:
http://newsreader.mathworks.com/matlabcentral/fileexchange/2168-linear-algebra-labs-with-matlab-2e/content/hill/LABBOX/rrefquik.m
You may want to let your students know that they will encounter 
functions which don't work, and this is not an excuse for not doing 
their homework.
Alejandra