"Subscripted assignment dimension mismatch" Error

Question

Holly Pothier 2018-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/397354-subscripted-assignment-dimension-mismatch-error

评论： Holly Pothier 2018-4-25

Hello,

I am working on a script that was made a few years ago. I had to make some changes to it, and now I can get it to run on certain images, but not on all. When I change the images in my folder to a new set, I get the error:

Subscripted assignment dimension mismatch.

Error in luminance (line 29)
    alc(i,1).rgb(:,:,:) = imread(alcJPG(i).name); %now in format [rows columns RGB=1,2,3]

I have included the relevant portion of the code below. I'm not sure why I am only getting this error on some images and not others. Thank you for the help.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

   %read in alc and nonalc images and convert to RBG with imread
  display ('reading alc and nonalc images');
  cd(alc_dir);
  alcJPG = dir('*.JPG'); %alcohol images
  for i = 1:length(alcJPG)
      alc(i,1).rgb(:,:,:) = imread(alcJPG(i).name); %now in format [rows columns RGB=1,2,3]
      alc(i).hsv = rgb2hsv(alc(i).rgb); %convert to HSV               %%%(Hue, Saturation, Value)
      alc(i).ycbcr = rgb2ycbcr(alc(i).rgb); %convert to YCbCr         %%%(brightness, two color dif signals- Cb and Cr)
      alc(i).lab = RGB2Lab(alc(i).rgb); %convert to Lab               %%%(Lightness and color-opponent dimenstions-- a and b)
  end
  cd(nonalc_dir);
  nonalcJPG = dir('*.JPG'); %nonalcohol images
  for i = 1:length(nonalcJPG)
      nonalc(i,1).rgb(:,:,:) = imread(nonalcJPG(i).name); %now in format [rows columns RGB=1,2,3]
      nonalc(i).hsv = rgb2hsv(nonalc(i).rgb); %convert to HSV, V = 3 (value)
      nonalc(i).ycbcr = rgb2ycbcr(nonalc(i).rgb); %convert to YCbCr, Y = 1 (luminance)
      nonalc(i).lab = RGB2Lab(nonalc(i).rgb); %convert to Lab
  end
  cd(p);
display ('calculating RGB means');
for i = 1:length(nonalc)
    %RGB means
    alc(i).meanRintensity = mean(mean(alc(i).rgb(:,:,1),2),1);
    alc_meanR(i) = alc(i).meanRintensity;
    alc(i).meanGintensity = mean(mean(alc(i).rgb(:,:,2),2),1);
    alc_meanG(i) = alc(i).meanGintensity;
    alc(i).meanBintensity = mean(mean(alc(i).rgb(:,:,3),2),1);
    alc_meanB(i) = alc(i).meanBintensity;
    nonalc(i).meanRintensity = mean(mean(nonalc(i).rgb(:,:,1),2),1);
    nonalc_meanR(i) = nonalc(i).meanRintensity;
    nonalc(i).meanGintensity = mean(mean(nonalc(i).rgb(:,:,2),2),1);
    nonalc_meanG(i) = nonalc(i).meanGintensity;
    nonalc(i).meanBintensity = mean(mean(nonalc(i).rgb(:,:,3),2),1);
    nonalc_meanB(i) = nonalc(i).meanBintensity;
      %HSV mean (only store V)
      alc(i).meanVintensity = mean(mean(alc(i).hsv(:,:,3),2),1);
      alc_meanV(i) = alc(i).meanVintensity;
      nonalc(i).meanVintensity = mean(mean(nonalc(i).hsv(:,:,3),2),1);
      nonalc_meanV(i) = nonalc(i).meanVintensity;
      %YCbCr mean (only store Y)
      alc(i).meanYintensity = mean(mean(alc(i).ycbcr(:,:,1),2),1);
      alc_meanY(i) = alc(i).meanYintensity;
      nonalc(i).meanYintensity = mean(mean(nonalc(i).ycbcr(:,:,1),2),1);
      nonalc_meanY(i) = nonalc(i).meanYintensity;
      %Lab mean (only store L)
      alc(i).meanLintensity = mean(mean(alc(i).lab(:,:,1),2),1);
      alc_meanL(i) = alc(i).meanLintensity;
      nonalc(i).meanLintensity = mean(mean(nonalc(i).lab(:,:,1),2),1);
      nonalc_meanL(i) = nonalc(i).meanLintensity;
  end
%to apply SHINE to the image need to replace V with Y to change to HSL -
%but SHINE is only useful if we want to match the luminance in the images,
%not just report it
%therefore, let's create a text output with all of these values in order to
%input to spss
out = fopen([export_dir 'luminance_test_4.25a.txt'], 'wt');
fprintf(out,'img, group, meanR, meanG, meanB, meanV, meanY, meanL\n');
for i = 1:length(alcJPG) %%this should be the # of jpgs in folder
    display ('alc out');
    if length(alcJPG(i).name(1:4)) == 4 %%AT added: if first 4 letters = 4 letters (always will) then....
    %if length(alcJPG(i).name) == 6; %%original was basing if on length of
    %filename... changed it to work around this
       fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(:),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i)); %%.name(ratio) here is printing to output the first 2,3,4 letters...WHY?
                                                                  %%.name(:) prints whole filename  
    elseif length(alcJPG(i).name) == 7
        fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(1:3),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i));
    elseif length(alcJPG(i).name) == 8
        fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(1:4),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i));
    end
end
for i = 1:length(nonalcJPG)
    display ('nonalc out');
    if length(nonalcJPG(i).name) == 6
        fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(1:2),nonalc_mefclose(out),anR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    elseif length(nonalcJPG(i).name(1:7)) == 7 %%changed ==7 rather than 6 like alc because 6 here has a weird line (mefclose(out))
    %elseif length(nonalcJPG(i).name) == 7
         fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(:),nonalc_meanR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    elseif length(nonalcJPG(i).name) == 8
        fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(1:4),nonalc_meanR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    end
end

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Holly Pothier 2018-4-25

Unfortunately I only have access to 2014a. I will try to find a more recent version and run this, thank you.

Walter Roberson 2018-4-25

I posted a follow-up there describing what would need to be done for earlier versions.

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Answer 1

Holly Pothier 2018-4-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/397354-subscripted-assignment-dimension-mismatch-error#answer_317182

Here are some examples of the filenames that work, and do not work:

This type of filename works: 1P_1.jpg, but when I use their resized versions with the filename: 1P_1_RS.jpg I get the error above. This occurs with our two image types/folders.

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Walter Roberson 2018-4-25

在 MATLAB Online 中打开

I am not seeing any difficulty even testing in R2014a.

Before using this, RGB2Lab must be on your MATLAB path (not just in your current directory, because you cd around to other directories.)

The below is the script I am using:

alc_dir = '/Users/roberson/MATLAB/3/397/397354/alc_dir'; 
nonalc_dir = '/Users/roberson/MATLAB/3/397/397354/nonalc_dir';
p = '/Users/roberson/MATLAB/3/397/397354';
export_dir = '/Users/roberson/MATLAB/3/397/397354/out';
ext = '.jpg';
%read in alc and nonalc images and convert to RBG with imread
  display ('reading alc and nonalc images');
  cd(alc_dir);
  alcJPG = dir(['*' ext]); %alcohol images
  for i = 1:length(alcJPG)
      alc(i,1).rgb(:,:,:) = imread(alcJPG(i).name); %now in format [rows columns RGB=1,2,3]
      alc(i).hsv = rgb2hsv(alc(i).rgb); %convert to HSV               %%%(Hue, Saturation, Value)
      alc(i).ycbcr = rgb2ycbcr(alc(i).rgb); %convert to YCbCr         %%%(brightness, two color dif signals- Cb and Cr)
        alc(i).lab = RGB2Lab(alc(i).rgb); %convert to Lab               %%%(Lightness and color-opponent dimenstions-- a and b)
    end
    cd(nonalc_dir);
    nonalcJPG = dir(['*' ext]); %nonalcohol images
    for i = 1:length(nonalcJPG)
        nonalc(i,1).rgb(:,:,:) = imread(nonalcJPG(i).name); %now in format [rows columns RGB=1,2,3]
        nonalc(i).hsv = rgb2hsv(nonalc(i).rgb); %convert to HSV, V = 3 (value)
        nonalc(i).ycbcr = rgb2ycbcr(nonalc(i).rgb); %convert to YCbCr, Y = 1 (luminance)
        nonalc(i).lab = RGB2Lab(nonalc(i).rgb); %convert to Lab
    end
    cd(p);
display ('calculating RGB means');
for i = 1:length(nonalc)
    %RGB means
    alc(i).meanRintensity = mean(mean(alc(i).rgb(:,:,1),2),1);
    alc_meanR(i) = alc(i).meanRintensity;
    alc(i).meanGintensity = mean(mean(alc(i).rgb(:,:,2),2),1);
    alc_meanG(i) = alc(i).meanGintensity;
    alc(i).meanBintensity = mean(mean(alc(i).rgb(:,:,3),2),1);
    alc_meanB(i) = alc(i).meanBintensity;
    nonalc(i).meanRintensity = mean(mean(nonalc(i).rgb(:,:,1),2),1);
    nonalc_meanR(i) = nonalc(i).meanRintensity;
    nonalc(i).meanGintensity = mean(mean(nonalc(i).rgb(:,:,2),2),1);
    nonalc_meanG(i) = nonalc(i).meanGintensity;
    nonalc(i).meanBintensity = mean(mean(nonalc(i).rgb(:,:,3),2),1);
    nonalc_meanB(i) = nonalc(i).meanBintensity;
        %HSV mean (only store V)
        alc(i).meanVintensity = mean(mean(alc(i).hsv(:,:,3),2),1);
        alc_meanV(i) = alc(i).meanVintensity;
        nonalc(i).meanVintensity = mean(mean(nonalc(i).hsv(:,:,3),2),1);
        nonalc_meanV(i) = nonalc(i).meanVintensity;
        %YCbCr mean (only store Y)
        alc(i).meanYintensity = mean(mean(alc(i).ycbcr(:,:,1),2),1);
        alc_meanY(i) = alc(i).meanYintensity;
        nonalc(i).meanYintensity = mean(mean(nonalc(i).ycbcr(:,:,1),2),1);
        nonalc_meanY(i) = nonalc(i).meanYintensity;
        %Lab mean (only store L)
        alc(i).meanLintensity = mean(mean(alc(i).lab(:,:,1),2),1);
        alc_meanL(i) = alc(i).meanLintensity;
        nonalc(i).meanLintensity = mean(mean(nonalc(i).lab(:,:,1),2),1);
        nonalc_meanL(i) = nonalc(i).meanLintensity;
    end
%to apply SHINE to the image need to replace V with Y to change to HSL -
%but SHINE is only useful if we want to match the luminance in the images,
%not just report it
%therefore, let's create a text output with all of these values in order to
%input to spss
out = fopen(fullfile(export_dir, 'luminance_test_4.25a.txt'), 'wt');
fprintf(out,'img, group, meanR, meanG, meanB, meanV, meanY, meanL\n');
for i = 1:length(alcJPG) %%this should be the # of jpgs in folder
    display ('alc out');
    if length(alcJPG(i).name(1:4)) == 4 %%AT added: if first 4 letters = 4 letters (always will) then....
    %if length(alcJPG(i).name) == 6; %%original was basing if on length of
    %filename... changed it to work around this
       fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(:),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i)); %%.name(ratio) here is printing to output the first 2,3,4 letters...WHY?
                                                                  %%.name(:) prints whole filename  
    elseif length(alcJPG(i).name) == 7
        fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(1:3),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i));
    elseif length(alcJPG(i).name) == 8
        fprintf(out,'%s, alc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', alcJPG(i).name(1:4),alc_meanR(i),alc_meanG(i), ...
            alc_meanB(i),alc_meanV(i),alc_meanY(i),alc_meanL(i));
    end
end
for i = 1:length(nonalcJPG)
    display ('nonalc out');
    if length(nonalcJPG(i).name) == 6
        fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(1:2),nonalc_mefclose(out),anR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    elseif length(nonalcJPG(i).name(1:7)) == 7 %%changed ==7 rather than 6 like alc because 6 here has a weird line (mefclose(out))
    %elseif length(nonalcJPG(i).name) == 7
         fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(:),nonalc_meanR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    elseif length(nonalcJPG(i).name) == 8
        fprintf(out,'%s, nonalc, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f, %4.4f\n', nonalcJPG(i).name(1:4),nonalc_meanR(i),nonalc_meanG(i), ...
            nonalc_meanB(i),nonalc_meanV(i),nonalc_meanY(i),nonalc_meanL(i));
    end
end

Holly Pothier 2018-4-25

...that fixed the problem / error. Thank you for your help and all the suggestions.

I will try with all my stimuli and report back.

Thanks again.

Holly Pothier 2018-4-25

It works with all my stimuli now. Thank you.

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"Subscripted assignment dimension mismatch" Error

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