AMSC 661 / CMSC 661 Spring 2010

Frequently Asked Questions for Homework 4

Question: 04-12-2010: What is the due date? How should I submit it?

Answer: This assignment is due at 4:00pm on Monday, April 26. Late penalties begin at 4:01. There are two acceptable ways to submit it: (1) Give it to me in the classroom, before class begins. (2) Deliver it to my office, any time prior to when I leave for class on the due date. (Slide it under the door if I am not there.) Do not put it in my mailbox, and do not leave it in my office after I leave for class on the due date. Email submission is acceptable only in "emergencies".

Question: 04-12-2010: What are the point values for the challenges?

Answer: 35 points total.
Challenge 1: 8 points for plot and u(-0.4,0.1) value.
Challenge 2a: 8 points for program and 3 points for plot, max temperature and the point at which it occurs.
Challenge 2b: 3 points for plot, 5 points for program, 8 points for justification. (Write a well-reasoned paragraph that discusses all of the sources of error.)

Question: 04-12-2010: What should I submit?

Answer: This is discussed in the challenges.

Grading notes:

  • Partial credit is given for partially-working programs.
  • Sometimes I might ask you to email your program files to me so that I can run them, so don't discard them.
  • Late penalties (see syllabus) are calculated problem-by-problem, so if you are finished with some problems but not all, hand in what you have finished.
  • Question: 04-14-2010 The equations for Challenge 2 don't involve t.

    Answer: This is a bad set of typos. I'm very sorry. Please see the reposted assignment, with changes marked in green.

    Question: 04-15-2010 Does everything start out at room temperature?

    Answer: Yes.

    Question: 04-19-2010 In Challenge 2, on my machine, Matlab runs out of memory.

    Answer: OK. Indicate on your submission that you don't have enough memory to refine the mesh 4 times and just refine it 3 times, or 2, or whatever you can do.

    Your temperature graph might be a bit bumpy, though.

    Question: 04-23-2010 When I run parabolic, it never returns.

    Answer: Check that you set c and f to row vectors, not column vectors.

    Question:

    Answer: