rename file extension from 1.png to 001.png and so on

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Tulips 2012-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/50586-rename-file-extension-from-1-png-to-001-png-and-so-on

hi everyone,can I know how to rename the extension of 1.png to 001.png in matlab script!for your information, from the loop of my coding, the file has been created as 1.png and saved in a folder. however, I want to name the file as 001.png in my matlab script. how to do it.besides, if I have more than one file I should make it automatically rename as 001.png, 002.png ,003.png. how to make it? thank you.

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Azzi Abdelmalek 2012-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/50586-rename-file-extension-from-1-png-to-001-png-and-so-on#answer_61743

编辑：Azzi Abdelmalek 2012-10-12

在 MATLAB Online 中打开

folder='D:\answers\'
for k=1:1
file1=sprintf('%d.png ',k)
file2=sprintf('00%d.png',k)
dos_com=['!rename ', folder  file1 file2]
eval(dos_com)
end

Edited code (Simon's suggestions)

folder='D:\answers\'  % e.g
for k=1:4
 file1=[folder sprintf('%d.png ',k)]
 file2=[folder sprintf('00%d.png',k)]
 movefile(file1 ,file2] 
end

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Walter Roberson 2012-10-15

Have you moved the existence test to before you imwrite() ? Are you doing something meaningful when you find that the file exists?

And are you truly wanting to output exactly the same output file for BlobsNo's worth of files ? Notice that once you have converted the image to grayscale when k=1, and resized to 40 x 40, that subImage will remain grayscale and 40 x 40 for all the rest of the values of k.

Tulips 2012-10-15