Subject: Reminder regarding collaboration

(This message is being sent to all CPSC 101 section 302 students)

Two students made a rare and wonderous error in fade.c. Namely
they both incorrectly

(1) overrode the parameter factor with a hardcode factor = 0.5;  in
    fade_ppm_image() and then
(2) they both needlessly repeated the override in the other two
    functions.

Needless to say, this makes me wonder if my "no collaboration
rules" were being ignored.

I encourage you all to take special care to ensure that you do
follow the rules.  To be honest,  if your solution is 100% correct
and you take reasonable steps to disguise your collaboration,
it can be quite difficult to detect collaboration.  But oddball
errors such as this JUMP OUT OF THE PAGE out like a sore thumb
110% of the time.

Hence the only (fairly) safe time to collaborate is if you are
100% sure what you are turning in does not duplicate a "STRANGE
and WONDEROUS" error that is instantly recognizable.  But if
you can do that, then you necessarily understand how to do the
assignment correctly!  Neither of the students involved here
asked me for help --

Even if you are not intentionally collaborating, if you do stuff
like leave listings lying around, leave your directories unprotected
or loan your computer to another student, you leave yourself open
to serious charges if another student takes advantage of your
carelessness.

Also please remember that extra credit is available for students
who turn in collaborators.