Error in saving plot as PNG?

2021 10 7
2 个回答
回答已采纳
更新时间：2021 10 8
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0 个投票

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

0 个投票

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
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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

0 个投票

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
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john karli
john karli 2021-10-7
it is giving the same error:
Error using print (line 83)
PNG library failed: Write Error.
Error in saveas (line 181)
print( h, name, ['-d' dev{i}] )
Walter Roberson
Walter Roberson 2021-10-7
编辑：Walter Roberson 2021-10-7
How large is your axes (how many pixels) ?
Do you have write access to the array 16QAM ?
john karli
john karli 2021-10-7
编辑：john karli 2021-10-7
its .mat file contain 1x1024x2 complex variable. the code have save 3385 pngs but after that it gives error of PNG library
Walter Roberson
Walter Roberson 2021-10-7
There is a chance that file descriptors are leaking. You could periodically
fclose('all')
but that will not help if the file descriptor is leaked inside the png library.
Which operating system are you using? If it is MacOS or Linux I might be able to suggest some tools to check file usage. Windows would take me more research.
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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