Using mask and creating array

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.

Answer 1

[Image Analyst]

1. A(:)

2. A(1:(M/2), :);

3. What is B? How about B = zeros(size(A));

Did I just do your homework???

[Kratos]

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]

B = zeros(size(B));  % Now B is the same size but all zeros.

[Kratos]

For number 2 what is M? Thank You.

[Image Analyst]

You said A is a "MxN" array. I would think you should know what M is. It's the number of rows.

[Kratos]

I got confused. Thanks :)