Understand a question. HELP!
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Hi guys, can you help me understanding what does the question ask for? Suppose C is the matrix:
1 2 3
4 5 6
7 8 9
10 11 12
Create a matrix C2 that is the upper left 2 × 2 submatrix of C.
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Joseph Cheng
2015-2-26
编辑：Joseph Cheng
2015-2-26
what submatrix means is a subset formed by taking a block of size mxn (in your example 2x2) from the original matrix. so the 2x2 submatrix of C that is the upper left means it would be the upper left corner 2x2 [1 2;4 5].
So the question is probably asking you to define a new submatrix C2 by the means of array indexing (is that the right word?) instead of hard coding it in. you can read up on it here http://www.mathworks.com/help/matlab/math/matrix-indexing.html. So eventually it would look like:
C2=C(_somethinghere_).
4 个评论
AnnaMaria Accardo
2015-2-26
Image Analyst
2015-2-26
C2 will not be bigger. It's the upper left 2x2 of a 4 x 3 matrix, so it's smaller, not bigger. The "rest" of the C matrix is ignored - it's not extracted and put into C2.
AnnaMaria Accardo
2015-2-26
Joseph Cheng
2015-2-26
Anytime, trying to get back into this after a few month hideous.
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