Problem by saveas plot

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CSCh 2020-12-20

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回答： Image Analyst 2021-1-5

采纳的回答： CSCh

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Hi everyone, I do not understand what I'am doing woring in saving my plot.

My code:

Temp=[num2str(vaiable), 'Myplotnumber' ,num2str(n) ,'-dpng']; 
saveas(gcf,Temp);

it save the figure always with Var1Myplotnumber2.png.fig

why put matlab .fig at the end?

Thank you?

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CSCh 2020-12-20

If I use print(gca, Temp)

I got:

Error using alternatePrintPath

Invalid or unsupported printer '' specified.

Error in print (line 83)

pj = alternatePrintPath(pj);

Ive J 2020-12-20

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Pass gcf and not axes

print(gcf, 'test', '-dpng', '-r400')

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CSCh 2021-1-4

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Thank you all so much for your help. In my case the '-dpng' ending did not work.

if I change to:

Temp=['%MyName%' ,'.png'];

saveas(gcf, Temp)

it saves png format.

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Image Analyst 2020-12-20

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Use exportgraphics() instead if you have R2020a or later.

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CSCh 2020-12-21

Yes that works for me, but why does not my code work? Maybe something with my loop (num2str (n)), I have to check..

Image Analyst 2020-12-21

I don't know. You never showed me your exportgraphics() code that didn't work. You only showed it where it worked in the command window with a hard-coded filename string. Please post the non-working code from your m-file. Apparently it thinks your Temp did not have an extension on it. Are you sure Temp ends in '.png'?

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Walter Roberson 2020-12-21

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Temp = {sprintf('%dMyplotnumber%d.png', vaiable, n),'-dpng'};
saveas(gcf, Temp{:})

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Image Analyst 2021-1-5

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You can do

baseFileName = sprintf('%d Myplotnumber %d.png', variable, n); % Name without folder.
fullFileName = fullfile(yourFolder, baseFileName); % Prepend folder.
saveas(gcf, fullFileName);