loop save new name and save .mat

Question

Adisorn Phanukthong 2017-1-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321727-loop-save-new-name-and-save-mat

评论： Adisorn Phanukthong 2017-1-26

This is main function

function [] = READIMAGEFORAREA ()
srcFiles = dir('C:\Users\xzaa\Documents\MATLAB\bwwalk2\*.jpg');  % the folder in which ur images exists
 j=1;
for i = 1 : length(srcFiles)
    filename = strcat('C:\Users\xzaa\Documents\MATLAB\bwwalk2\',srcFiles(i).name);
    I = imread(filename);
    imshow(I);
    drawnow;
   AREAPICTURE (I,j);
    j=j+1;
end
end

and 2nd function

function [] = AREAPICTURE (BW,i)
BWAREA = bwarea(BW);
j=num2str(i);
save('AREA.mat',strcat('BWAREA00'),j);
end

I want to save in file .mat and save many object in .mat in code that error loop in program

this error Error in AREAPICTURE (line 4) save('AREA.mat',strcat('BWAREA00'),j);

Error in READIMAGEFORAREA (line 9) AREAPICTURE (I,j);

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Jan 2017-1-24

编辑：Jan 2017-1-24

Please read and apply: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup . Then edit the question and insert the complete error message: currently we can only see, where the problem occurres, but not which problem.

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Answer 1

Jan 2017-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/321727-loop-save-new-name-and-save-mat#answer_251816

在 MATLAB Online 中打开

Your code:

function [] = AREAPICTURE (BW,i)
BWAREA = bwarea(BW);
j = num2str(i);
save('AREA.mat',strcat('BWAREA00'),j)

This is equivalent to the call (when i=7):

save AREA.mat BWAREA00 7

and tries to save the variables "BWAEREA00" and "7" to the file called "AREA.mat". Due to the lack of comment we have to guess the intention of this code. A bold guess:

function AREAPICTURE(BW, index)   % Use "i" for the imaginary unit only
BWAREA = bwarea(BW);
save(sprintf('BWAREA%03d.mat', index), 'BWAREA')

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Adisorn Phanukthong 2017-1-25

Jan 2017-1-25

编辑：Jan 2017-1-25

The message means, that you do not have write permissions in the current folder. Then add a folder using fullfile.

Please explain, if you want to save multiple files or 1 MAT file only.

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Answer 2

Walter Roberson 2017-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/321727-loop-save-new-name-and-save-mat#answer_251898

在 MATLAB Online 中打开

function AREAPICTURE(BW, index)   % Use "i" for the imaginary unit only
  BWAREA = bwarea(BW);
  field = sprintf('BWAREA%d', index);
  datastruct.(field) = BWAREA;
  save('AREA.mat', '-struct', 'datastruct', '-append')

If you were to use a -v7.3 .mat file then you could handle this a bit more cleanly using matFile()

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Walter Roberson 2017-1-25

在 MATLAB Online 中打开

Possibly the problem occurs while reading the 21st image. You should put in some debugging:

function [] = READIMAGEFORAREA ()
projectdir = 'C:\Users\xzaa\Documents\MATLAB\bwwalk2'
srcFiles = dir( fullfile(projectdir, '*.jpg') );
IGNORETHISVARIABLE = [];   %the file needs to exist
save( 'AREA.mat', 'IGNORETHISVARIABLE');
for index = 1 : length(srcFiles)
    filename = fullfile(projectdir, srcFiles(index).name );
    fprintf('about to read image #%d: "%s"\n', index, filename);
    I = imread(filename);
    fprintf('image #%d read\n', index);
    imshow(I);
    drawnow;
    AREAPICTURE(I, index);
end
function AREAPICTURE(BW, index)
  BWAREA = bwarea(BW);
  field = sprintf('BWAREA%d', index);
  datastruct.(field) = BWAREA;
    fprintf('about to save field %s\n', field);
    save('AREA.mat', '-struct', 'datastruct', '-append')
    fprintf('saved field %s\n', field);