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 2012-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/46277-is-there-a-way-to-dynamically-save-a-plot-figure-into-a-jpeg-file-without-having-to-type-the-filenam

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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Answer 1

José-Luis 2012-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/46277-is-there-a-way-to-dynamically-save-a-plot-figure-into-a-jpeg-file-without-having-to-type-the-filenam#answer_56596

在 MATLAB Online 中打开

saveas(figureHandle,['filename' num2str(numberId) '.jpg']);

For more info:

help saveas

Cheers!

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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 2012-8-19

在 MATLAB Online 中打开

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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Answer 2

Image Analyst 2012-8-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46277-is-there-a-way-to-dynamically-save-a-plot-figure-into-a-jpeg-file-without-having-to-type-the-filenam#answer_56598

编辑：Image Analyst 2012-8-18

在 MATLAB Online 中打开

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 2012-8-18

在 MATLAB Online 中打开

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 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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