ddd 2018-11-23

Those of you having trouble with coding may want to have some of your
group write *.lp files (in the style of the solutions to Homeworks 1 and 2)
while the others debug, for the following reasons:

-- *.lp files don't require any coding

-- *.lp files are reasonable to write for toy examples and small examples

-- many projects last year were written as (5 or more) *.lp files, even
  some that would have been much smaller and simpler using Models and
  their methods, such as *.addVars() and *.addConstrs()

You might compare the Latin square solution of Homework 2 to that of
Homework 4.

Note: you can use any LP/IP/QP software you like; you should test the
software on toy examples.  If you want to use Python/Gurobi, you might
want to work on the worksheet of 11_02; using a debugging environment
such as Spyder (which we accessed via Anaconda) can help.