Help for setting the formatSpec

Question

Hong Thien Dang 2021-8-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1443409-help-for-setting-the-formatspec

评论： Jan 2021-8-30

采纳的回答： Jan

在 MATLAB Online 中打开

Hi everyone,

I'm trying to read a picture file and get the size of the picture and print it to txt file. I want it like:

size img1.png

2448 3264 3

size img2.png

2458 3464 3

........

But i don't know how to do it, please help me with the code.

Here my code:

for k = 1: length(jpgFiles)
    baseFileName = jpgFiles(k).name;
    fullFileName = fullfile(Folder, baseFileName);
    fprintf(1, 'Reading %s\n', fullFileName);
    imageArray = imread(fullFileName);
    E=size(imageArray);
    fid=fopen('Result.txt','a');
    fprintf(fid,'%.d\n',E);
    fclose(fid);

Thank you very much!

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Answer 1

Jan 2021-8-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1443409-help-for-setting-the-formatspec#answer_777254

编辑：Jan 2021-8-30

在 MATLAB Online 中打开

fprintf(fid,'%d %d %d\n', E);

It is much faster to open the file once only:

 fid = fopen('Result.txt','a');
 for k = 1:length(jpgFiles)
    baseFileName = jpgFiles(k).name;
    fullFileName = fullfile(Folder, baseFileName);
    fprintf(1, 'Reading %s\n', fullFileName);
    imageArray = imread(fullFileName);
    E = size(imageArray)   
    fprintf(fid, 'size %s\n', baseFileName);  % [EDITED]
    fprintf(fid, '%d     %d     %d\n', E);
 end
 fclose(fid);