CS 221 Fall 2011 - Grading Sheet for Problem Set 2

The purpose of this assignment is to reinforce the concepts of MATLAB programming, including loops. Parts of the text relevant to this assignment are Chapter 3 and Chapter 4.

This assignment has three parts; you will submit a single "zip" archive containing your answers to all three parts. This archive should contain five files in all: divalg.m, loop.m, grades.m, hypot.m and sections.m.)

Late Submission Penalties

General Policies

Because we have around 180 submissions to grade, it is important that you follow the instructions about what to submit and how to format it. (Note: 15 minutes grading time for each of 180 submissions = 45 hours.)

• Failure to include directory in zip file: 10% penalty.
• Sending one or more files in some format other than .m: 15% penalty.
• Missing files for some parts: no points for that part.

Note that you can submit an assignment to CS Portal more than once, but your submission should contain all files in a single archive. If you submit more than once, only the last submission will be scored.

Part 1: Implementing an algorithm with a while-loop

20 points for this problem. Deductions for:

• Wrong boolean expression for while (5 points off)
• Missing update for one or both of the remainder and quotient variables (-10)
• fprintf has wrong formatting string or no formatting string (-5)
• Formatting issues, output not suppressed or other minor issues (-2)

Part 2: Using for-loops in MATLAB

Problem 1: 20 points total. Deductions for:

• Problems with creating the array of random numbers or with the initialization of the minimum, maximum, or sum. (5 points off)
• Generated random integers instead of floating point numbers, or generated numbers for an incorrect range. (-2)
• Problems with the for loop or how it was indexed. (-5)
• Problems with how minimum, maximum, sum, or mean was calculated, including the incorrect use of if statements where needed. (-5)
• fprintf has wrong formatting string or no formatting string.
• Formatting issues, output not suppressed or other minor issues (-2)

Problem 2: 20 points total. Deductions for:

• Wrong indexing in for loop (-5)
• No gradesEquivalent array but somehow showed the output (-2)
• Semicolon behind if-else statement (-5)
• Missing if-else statement (-10)
• Wrong or complicated boolean expression in if-else (-5)
• Missing output for grades equivalent (-5)
• Formatting issues, output not suppressed or other minor issues (-2)

Problem 3: 15 points total. Deductions for:

• Code not properly formatted as a function with two parameters for input and returning an array as output. (-5)
• Wrong indexing or other problems with for loop. (-5)
• Incorrect formula for calculation of hypotenuse of a right triangle. (-5)
• Formatting issues, output not suppressed or other minor issues (-2)

Part 3: Accessing Sections of Arrays

25 points for this problem: 4 points for item 1, 2.5 points each for items 2-3, and 4 points each for items 4-7.