why overwrite cell in loop matlab?

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jenifer Ask 2019-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/498060-why-overwrite-cell-in-loop-matlab

评论： jenifer Ask 2019-12-26

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I try to calculate the distance of some picture, But on this Code, just remain the matrix distance of final picture.

Of course I see By F10 each output of distance of the points x1{i},y1{i} of the picture

image 1 have 15 points

image 2 have 22 points

image 3 have 18 points,... and mage 6, have 47 points,

this picture, result showed run my code that remain the matrix distance of final image.

    vecPoint{i}=[x1{i},y1{i}];
    [m{i} n{i}] = size(vecPoint{i});
    
    n{i} = m{i};
    Dist{i} = zeros(m{i}, n{i});
    for ii = 2 : m{i}
        for jj = 2 : n{i}
            %%%%%%%%%%%%%%% Here  %%%%%%%%%%%%%%%%%%%%%%%%%
            Dist{jj,ii} = sqrt((vecPoint{i}(ii, 1) - vecPoint{i}(jj, 1)) ^ 2 + ...
                (vecPoint{i}(ii, 2) - vecPoint{i}(jj, 2)) ^ 2);
            
        end
    end
    

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Image Analyst 2019-12-26

Well it's doing what you're telling it to do. But what I don't know, is what you want it to do. What value does the poorly-named "i" have? Is that the loop iterator over images from 1 to 6? So all of that code is actually part of the inside of a loop over i? Why are you not using pdist2()? Do you not have the stats toolbox?

jenifer Ask 2019-12-26