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I am using saveas function of Matlab to save figures but sometimes it gives me "Error using print (line 82) PNG library failed: Could not open file.."

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Aditya
Aditya on 16 Aug 2018
Edited: Ann on 22 Jul 2021
I am using saveas function of Matlab to save figures but sometimes my loop breaks gives me the above error, so I restart the loop and it starts working again, which makes me wanna think if there is any bug in the saveas function, because my code seems to be running when started again.
for m = 1:305
mkdir (Names{m});
folder = Names{m};
k = 1;
Limit = size(samples{m},2)
if(GenderList(m) == 1)
Temp = 'male';
else
Temp = 'female';
end
for i = 1:Limit
[coeffs,delta] = mfcc(samples{m}(:,i),fs);
f = figure('visible', 'off');
baseFileName = strcat(Names{m},'_',Temp,'_coeffs_', num2str(i,'%02d'),'.png');
fullFileName = fullfile(folder, baseFileName);
imagesc(coeffs);
saveas(f, fullFileName, 'png');
baseFileName2 = strcat(Names{m},'_',Temp,'_delta_', num2str(i,'%02d'),'.png');
fullFileName2 = fullfile(folder, baseFileName2);
imagesc(delta);
saveas(f, fullFileName2, 'png');
k = k+1;
clear coeffs;
clear delta;
i
end
clear k;
clear Temp;
end
  1 Comment
Jan
Jan on 16 Aug 2018
This can happen if the file is existing, but opened already. Can you exclude this?
By the way, omit the useless clear commands. They waste time only here.

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Answers (1)

Ann
Ann on 21 Jul 2021
Edited: Ann on 22 Jul 2021
I recently experience this error too, when using
print(figurehandle, '-dpng', [path])
It seems to occur randomly; my function which repeatedly creates figures and saves them to a folder using above code will work a few times, then crash. Troubleshooting by putting 'keyboard' in the line before the crashing one, and running the print(...) command by Evaluate Selection, then often does NOT reproduce the error.
I now think that this has to do with the folder to which my function tries to print; this is a local directory that gets automatically synced by Dropbox. During syncing the permission may change briefly.

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