Error in saving plot as PNG?

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john karli
john karli 2021-10-7
评论： Walter Roberson 2021-10-8
for i = 3386:5100
%mkdir 8PSK
x = load(['frame_snr016QAM' num2str(i) '.mat']);
sps = 8;
eyediagram( x.frame , sps)
set(get(gcf, 'Children'), 'Visible', 'off')
cd 16QAM
pause(0.5)
saveas(gcf,['frame_snr016QAM' num2str(i) '.png']);
cd ..
close
end
error
Error using print (line 83)
PNG library failed: Write Error.
Error in saveas (line 181)
print( h, name, ['-d' dev{i}] )
I want to save the plot of eyediagram in a folder. but it was working correctly now i am facing png library failed issue. Please assist

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采纳的回答

Image Analyst
Image Analyst 2021-10-7
If you have R2020, try exportgraphics() instead of saveas().
And you can also use isfolder(). Replace
if ~exist(outdir, 'dir'); mkdir(outdir); end
with
if ~isfolder(outdir)
mkdir(outdir);
end
  2 个评论
john karli
john karli 2021-10-8
it works but how can i save it ?
Walter Roberson
Walter Roberson 2021-10-8
exportgraphics() saves directly to file -- it is a new routine intended to replace print() and saveas()

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更多回答（1 个）

Walter Roberson
Walter Roberson 2021-10-7
编辑：Walter Roberson 2021-10-7
outdir = '16QAM';
if ~exist(outdir, 'dir'); mkdir(outdir); end
for i = 3386:5100
in_filename = sprintf('frame_snr016QAM%d.mat', i);
out_filename = fullfile(outdir, sprintf('frame_snr016QAM%d.png', i));
x = load(in_filename);
sps = 8;
eyediagram(x.frame, sps)
set(get(gcf, 'Children'), 'Visible', 'off')
pause(0.5)
saveas(gcf, out_filename);
close
end
  6 个评论
显示 4更早的评论
john karli
john karli 2021-10-7
I am using windows. the error is same
Walter Roberson
Walter Roberson 2021-10-7
You might be able to use Process Explorer to find out whether your process is accumulating open files;
https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer

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