How to convert matrix to 1-D array and back to matrix form?
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I have a matrix of size say, W X H, i have to convert the matrix into a 1-D array and perform some operations(bitxor) and again retrieve back my image in the same dimension ie W X H. How to do it? Thanks in advance.
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Accepted Answer
Stephen23
on 27 Jul 2015
Edited: Stephen23
on 27 Jul 2015
>> A = [1,2,3,4;5,6,7,8]
A =
1 2 3 4
5 6 7 8
>> B = reshape(A,1,[]) % columnwise
B =
1 5 2 6 3 7 4 8
>> B = reshape(A.',1,[]) % rowwise
B =
1 2 3 4 5 6 7 8
>> reshape(B,size(A))
ans =
1 3 5 7
2 4 6 8
Note how one can use the transpose operator to select between columnwise and rowwise conversion from the matrix to the vector.
3 Comments
Stephen23
on 27 Jul 2015
Edited: Stephen23
on 27 Jul 2015
If the number of elements has changed then you will have to decide yourself how this should be dealt with. You have many choices, such as:
- define a new size based on the new number of elements
- removing some values
- padding
- subsampling
- interpolating
- extrapolating
- etc
What do you want to do?
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