From hssendov@barrow.uwaterloo.ca Wed Oct 22 08:22:43 1997
Date: Tue, 21 Oct 1997 18:01:41 -0400
From: Hristo Stoyanov Sendov <hssendov@barrow.uwaterloo.ca>
To: Henry Wolkowicz <hwolkowi@orion.math.uwaterloo.ca>
Subject: Grading of Assignment #2 is over!

Here are some rules that I formed while grading Assignment #2:

1.) Problems #6 on page 193 and #8 on page 195 were graded.
2.) Each one of them had three parts.
3.) The points for each particular part were:
    problem #6:
    part a)  5 pts.
    part b) 10 pts.
    part c) 15 pts.

    problem #8:
    part a) 15 pts.
    part b) 10 pts.
    part c)  5 pts.

4.) For problem #6;
    - If you have written incorrectly the direction of the inequalities
    in LP statement of the Diet Problem  - 3 pts.
    - If in addition you have forgotten other details more points were
    deducted.
    - You may have specifyed incorrectly the units of measurement of the
    dual variables.
    The above rules apply for both part a & b.

    - For not mentioning a word about sensitivity analysis -8pts.
    - For doing sensitivity analysis by only plugging different numbers
    in you example and resolving it -5pts (This is not sensitivity
    analysis!!!)

    - For not having any GAMS output or Output from the Optimization
    Technology Center's Diet Problem -7pts
    - You may have used the OTC's Diet Problem BUT YOU HAD TO ADJUST IT,
    so that it matches the assigned problem! This could be accomplished
    by editing the constraints and setting all upper bounds to a VERY
    LARGE number so that for practical purposes it is Infinity. This
    should teach you that you don't have to apply anything blindly.
    For not doing this -5pts.

5.) For problem #8
    - You just have to write down the dual problem of the Capital
    Budgeting problem (without discounting). This is what I meant by
    "Mathematically" (if you see this written in your assingment.
    All other attempts 'part a' to be explained were punished
    according to the degree of sense your explanation made.

NOTE 1: If you think I haven't seen something well in your homeworks 
please stop by my office and I will gladly have a second look.

NOTE 2: It is time that you learn what is Sensitivity Analysis!
One good reference that you can use is the C&O 350 Linear Optimization,
Course Notes, April 29, 1997. The explanation is great and
the language is accessible! The booklet is small and you can read it for
a weekend!!!