Using mask and creating array

2014 9 13
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更新时间：2014 9 13
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Hello, 1. How do I linearize Linearize variable A that should go from a MxN array to a (M*N)x1 column vector. The new (M*N)x1 vector should be calculated by going down the columns of "A".
2. How do I take the top half of the array i.e. all of the columns and the first half of the rows assuming that there are an even number of rows.
3. How do I create a mask where B is equal to 0?
Thank You.

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Image Analyst
Image Analyst 2014-9-13

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1. A(:)
2. A(1:(M/2), :);
3. What is B? How about B = zeros(size(A));
Did I just do your homework???

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Kratos
Kratos 2014-9-13
No you didn't. For 3 B is an array of numbers. You have to create mask where B is equal zeros. I tried but I just don't know how to use mask.
Image Analyst
Image Analyst 2014-9-13
B = zeros(size(B)); % Now B is the same size but all zeros.
Kratos
Kratos 2014-9-13
For number 2 what is M? Thank You.
Image Analyst
Image Analyst 2014-9-13
You said A is a "MxN" array. I would think you should know what M is. It's the number of rows.
Kratos
Kratos 2014-9-13
I got confused. Thanks :)

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