[closed] HW6.2 *Better* clarification needed.

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The "clarification" on HW6.2 does not clarify. Please answer these specific questions regarding degenerate block diagonal matrices:

  1. For the purposes of this question, must the blocks be non-diagonal?
  2. For the purposes of this question, are all NxN square matrices considered block diagonal by virtue of them containing one huge NxN block?

These may sound like dumb questions, but some of us believe that they affect the answer.

asked 31 Mar '12, 16:52

John-Paul's gravatar image

John-Paul
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closed 03 Apr '12, 10:10

The question has been closed for the following reason "Duplicate Question" by John-Paul 03 Apr '12, 10:10

3 Answers:
1

For (2), technically yes, HOWEVER, video says:

  • 01:15 — small number K ...
  • 01:21 — but the K is independent of the path lengths like 1, 2, or 3,

The subtitles say 'path links', but it is 'path lengths'. For your question, K would not be small, and it would change depending on how large the 'containing' matrix was.

link

answered 01 Apr '12, 15:44

Phil%20Duby-1's gravatar image

Phil Duby-1
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Maybe you must read http://www.udacity-forums.com/cs373/questions/27533/hw-62-clarification

link

answered 31 Mar '12, 17:01

Erik%20Zamora%20G%C3%B3mez's gravatar image

Erik Zamora ...
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Yes, I read that before posting my question.

(31 Mar '12, 17:13) John-Paul John-Paul's gravatar image
0

Take a look at HW 6.2 Clarification again, @GundegaUdacity has answered this specific question now:

Yes, that is exactly what that means - "a diagonal matrix is not a
block-diagonal matrix" for the purpose of this exercise. And the
clarification was made to make this clear.

(And for question 2 I think it is safe to assume no, one huge NxN block does not count as block diagonal.)

link

answered 01 Apr '12, 13:59

M%C3%A5rten's gravatar image

Mårten
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edited 01 Apr '12, 14:22

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Asked: 31 Mar '12, 16:52

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Last updated: 03 Apr '12, 10:10

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