Error in saving plot as PNG?

30 次查看（过去 30 天）

john karli 2021-10-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1468561-error-in-saving-plot-as-png

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst 2021-10-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1468561-error-in-saving-plot-as-png#answer_803561

在 MATLAB Online 中打开

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
显示无隐藏无

john karli 2021-10-8

it works but how can i save it ?

Walter Roberson 2021-10-8

exportgraphics() saves directly to file -- it is a new routine intended to replace print() and saveas()

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson 2021-10-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1468561-error-in-saving-plot-as-png#answer_803226

编辑：Walter Roberson 2021-10-7

在 MATLAB Online 中打开

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