Is there a way to dynamically save a plot figure into a jpeg file without having to type the filename i would be saving it into?

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Laura
Laura 2012-8-18
评论： Image Analyst 2021-3-24
I am executing a code that generates a plot figure, which I save using the following command: print '-djpeg' '-f2' '-r300' _f2
Where _f2 is literally the name of the jpeg I will be saving my plot into.
I wonder if there's a way of doing this dynamically, what i mean is that instead of entering the file name literally I could pass a string containing the file name, so I can execute this could without having to type each time the file name in my code.
As a previous step to generating the plot figure, I load a file and analyze it. Each file is identified with a frequency (filename=06000). My idea is to copy the filename (06000) into a string, so i can identify each jpeg with its corresponding file (06000.jpeg)
Thanks!!

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采纳的回答

José-Luis
José-Luis 2012-8-18
saveas(figureHandle,['filename' num2str(numberId) '.jpg']);
For more info:
help saveas
Cheers!
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Laura
Laura 2012-8-19
Ok the problem I had was that I wasn't using the figureHandle correctly I was using 'f3' instead of 'figure(3)'.
Now it's working perfectly and you have saved me a huge amount of time!!!
Thank you!!
Image Analyst
Image Analyst 2012-8-19
Strange, you wouldn't want to do that. You must have a figure handle already before you pass it into saveas(). Like this
f3 = figure(3);
% Now plot stuff.
% Now save figure.
saveas(f3,....);
If you did this
saveas(figure(3), ......);
it would probably create a brand new blank figure when it hits the figure(3) code, and then you'd be saving that (a blank figure).

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Image Analyst
Image Analyst 2012-8-18
编辑：Image Analyst 2012-8-18
Use sprintf() to construct your filename and then use export_fig() to save it:
baseFileName = sprintf('F%s_h%s.jpg', numberId, numberId);
fullFileName = fullfile(yourFolder, baseFileName);
export_fig(figureHandle, fullFileName); % Best way.
saveas(figureHandle, fullFileName); % Alternative way
http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions.
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Laura
Laura 2012-8-18
Hey, I tried the code as you said, but i dont know if im doing it right!
baseFileName = sprintf('F%s_h%s.jpg', freq, time);
fullFileName = fullfile('C:\To', baseFileName);
It loads the graph but doesnt save into a file.This is the message i get from executing the code:
Undefined function 'export_fig' for input arguments of type 'char'.
Correct me if im wrong, but here's what i understand for:
  • yourfolder i put the path to my current folder
  • figureHandle i put the figure id.
Thanks!
Undefined function 'export_fig' for input arguments of type 'char'.
Image Analyst
Image Analyst 2012-8-18
It look like you just ran the code and didn't read the FAQ. In the FAQ it explains how you can download export_fig. Anyway, here is the direct link: http://www.mathworks.com/matlabcentral/fileexchange/23629-exportfig Or you can go to the front page of the File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/ because it's always the most downloaded submission every month.

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Jürgen
Jürgen 2012-8-18
Hi,
with e.g.: freq=1 time=103 Filename = ['F' num2str(freq) '_h' num2str(time) '.jpg'] =>Filename =F1_h103.jpg then saveas(gcf, Filename)
this should work
regards,J
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