PHYS 210 2014: Homework 2 Bug List

1. Bugs are listed in reverse chronological order, with headings indicating which Problem(s) the bug relates to
2. The online homework handout (Click HERE) should always be up to date
3. Be sure to clear your browser cache as necessary---if you're not sure whether it's necessary or not, clear it just to be safe.
4. I will indicate whether or not there is any specific action that you will need to take, relative to the original instructions, to deal with the defect.

1 Oct 15: Problem 5: Bug in 5.3

Action you need to take: none

In the section ...

5.3 Sample output from a working implementation.

... the Maple screenshot shows the following values

0.75329 ...  and  -0.99975 ...

in the output from

> pts := chaos(6)

Those values are supposed to the coordinates of the 4th point, P^4, which I have asked you to define as

(5/4) cos(29/17)  and  (5/4) sin(29/17)

or

-0.16834 ...  and   1.2386 ...

Again, however, this bug is harmless ... even if you have "miscoded" the definition of P^4's coordinates (as I did), your implementation of chaos, and the results that it produces, should not be affected in any significant way. Also, such an error will have no impact on your grade.

Thanks to Mona.

2 Oct 3: Problem 1: larger_array assignment displays all elements

Action you need to take: none

If you were at the Oct 2 lab you should now have a ~/.mapleinit file that contains

interface(rtablesize=100):

Thus, when you get to page 12 of the worksheet, in the section "Selection of single array element using []", you probably will see all of the array elements in-line when you enter

larger_array := Array(1..30);

This is fine.

Thanks to Kevin Kwon.

3 Sep 30: Prelude: Mislabelling of Homework Assignment (!)

Action you need to take: none

Change: Homework 1 -> Homework 2

Thanks to Michael Horner.

4 Sep 30: Problem 1: array used instead of Array

Action you need to take: none

Page 16, convert section

The output will be the same whether you use array or, as I should have and you are free to do, Array.

Thanks to Chan Gwak.

5 Sep 30: Problem 1: Output from some commands doesn't match worksheet.

Action you need to take: none so far

In some instances, some of the commands that you enter in creating the facsimile will differ from my version of the worksheet:

1. If the expressions are algebraically equivalent, ignore the difference.
2. It they aren't, check what you've typed carefully and if you still think there's an issue, report it to me.

Typical reported example:

factor(big_poly)

produces

x(x - 1)(x - 3)(x + 2)(1 + x)

rather than

x(x - 1)(x - 3)(2 + x)(1 + x)

This is type 1---ignore the difference and carry on!

Thanks to Chan Gwak.