why am i getting only the last iteration value?

Question

karishma koshy 2019-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/473359-why-am-i-getting-only-the-last-iteration-value

评论： Stephen23 2019-7-29

i am trying to get how many times each iterations have repeated, which I have got using repmat. But at the end 'FRAM_FINAL' returns only the value of last iterations.

for FR=1:numimgs
    
    %To read in all images in TIFF-file
    output_image2=imread('C:\Users\user\Desktop\Photometrics_2x bin_video2.tif',FR);
    output_image3=double(output_image2);
    disp(num2str(FR))
    
    
    ii=output_image3 - meanImage
    I2 = mat2gray(ii);
    
    qq=fibermetric(I2, 38,'ObjectPolarity','Bright');
   
    
    [centreDark1, radiiDark1]=imfindcircles(qq, [Rmin Rmax],'Sensitivity',0.87,'ObjectPolarity','bright');
    centreDark = [centreDark;centreDark1];
    size(centreDark)
    radiiDark = [ radiiDark;radiiDark1];
    size(radiiDark)
    
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%repmat   
    frame=repmat(FR,1,length(centreDark(:,1)))
    FRAM_FINAL=frame(:)
end

Right now the final answer i am getting for the range FR=1:numimgs where numimgs=120

obtained result    120             expected answer: 1
                   120                              1
                   120                              2                             
                   120                              2 
                   120                              so on
                   120                              120
                   so on                            120
                   

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Answer 1

Samatha Aleti 2019-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/473359-why-am-i-getting-only-the-last-iteration-value#answer_385195

In the given code, “FRAM_FINAL” value is updated at every iteration. To make the vector “FRAM_FINAL” hold the results of each iteration, I would suggest concatenating the “FRAM_FINAL” at each iteration with its respective result using cat function.

For more information on concatenation, refer the following link

https://www.mathworks.com/help/matlab/ref/cat.html?s_tid=doc_ta

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Stephen23 2019-7-29

Note that for efficiency the MATLAB documentation recommends preallocating the output array before the loop, and using indexing into the array within the loop:

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

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