How do you convert linear array to 2by2 matrix?

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David Dijemeni
David Dijemeni 2013-6-22
I have a linear and I want to create a 2 by 2 matrix for every five values but I dont want to use a for loop as it is slow. Is there a more direct way?
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Azzi Abdelmalek
Azzi Abdelmalek 2013-6-22
David, can you edit your question. Give a short example and write what should be the result. If you are asking for a 2x2 array, you should show us this 2x2 array
Image Analyst
Image Analyst 2013-6-22
编辑：Image Analyst 2013-6-22
I don't understand either. You show a 4 by 4 array. What part(s) of that are the 2 by 2 arrays? The quadrants? Please use unique numbers so we can see where each number goes - there are too many 1s, 2s, and 4s to see where each one goes to. And where does the "five" (as in "for every five values") come into play? And what does this have to do with image processing?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-22
编辑：Azzi Abdelmalek 2013-6-22
Use reshape function
%example
x=1:20
out=reshape(x,2,2,[])
Image Analyst
Image Analyst 2013-6-22
% Create sample linear array
m = [1, 2, 3, 4]
% Create 2D array (probably the fastest way).
m2D = [m(1), m(2); m(3), m(4)]
% Alternate way
m2Da = reshape(m, [2, 2])

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