MATLAB: How to use loop to distribute values from one matrix to another matrix in a certain order

matrix

For example, let's say I have a 3×2 matrix called A and a 3×2 matrix called B. I want the first number in A (1st row, 1st column) to go to the first number in B (1st row, 1st column). However, I want the second number in A (1st row, 2nd column) to go to the 2nd row 1st column of B. I want the third number of A (2nd row, 1st column) to go to the 3rd row 1st column of B.

Is there a single code I can use or would I have to use multiple lines of codes? I know I can probably use loop or for loop, but how exactly?

(Visually it should look something like this)

Best Answer

Try this:

B = reshape(A(:)', [], 2)

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While you can generate variable names on the fly (using eval), it's not a good idea as it makes the code harder to understand, harder to debug, harder to check for syntax error and slower to execute.

In your case, what I would do is create structure arrays:

%hypothetical processing code
for imgindex = 1 : numimages
   img = loadimage(imgindex); %load an image
   numregions = regioncount(img); %get number of region
   for regionindex = 1 : numregions
      [area, centroid] = regionproperties(img, regionindex); %get property of region
      %HERE is where you store the result in structure arrays:
      imageprops(imgindex).region(regionindex).area  = area;
      imageprops(imgindex).region(regionindex).centroid = centroid;
   end
end

To access the area of the 5th region of the 3rd image:

area = imageprops(3).region(5).area;

Best Answer

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