loop save new name and save .mat

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);

[Jan]

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.

Answer 1

[Jan]

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')

[Adisorn Phanukthong]

output file that same in the picture

[Adisorn Phanukthong]

[Jan]

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.

Answer 2

[Walter Roberson]

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()

[Adisorn Phanukthong]

 '-struct', 'datastruct', '-append'  what is variable in this please tell me

[Walter Roberson]

The variable that it will write out is datastruct . However, the -struct option tells it not to write out the structure datastruct itself as a variable, and to instead look at the fields of the datastruct structure and write everything it finds as a field into the .mat as separate variables.

For example if index was 17 then field would be BWAREA17 so datastruct.(field) = BWAREA would assign to datastruct.BWAREA17 because of dynamic field names. Then the save() would look inside datastruct and find the field BWAREA17 and would use that to create a variable BWAREA17 in the .mat file.

[Adisorn Phanukthong]

thank you and Why does'nt not save all file i have 100 object

[Walter Roberson]

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);

[Adisorn Phanukthong]

Thank you first code run pass. promblem that about ram on my computer work single. I'm thank you so much. When I have problem. I'll say to you later.

Do you have Line ID or Social? I want contact to you

E-mail : [e-mail] Line : xzaazakudo