How can I put a string variable into a Figure Title?

FILE_NAME = '1.A.A';

figure('Name', 'Figure 1')
plot(X, Y, 'LineWidth', 1)
title('FILE %s: X vs Y (dB Mag)', FILE_NAME)
savefig('FILE %s: X vs Y.fig', FILE_NAME)

I have a large number of figures I'm plotting, so

I want to designate the variable FILE_NAME, and save the figures in my Current Folder.

• Currently, I'm getting an error, "Incorrect number of input arguments"

[Joe_Z]

I think you forgot the sprintf() within the title() function. title() only takes a single text input argument (or Name:Value Pairs) which is why it is throwing that error. Try:

figure('Name', 'Figure 1')
plot(X, Y, 'LineWidth', 1)
title(sprintf('FILE %s: X vs Y (dB Mag)', FILE_NAME))
savefig(sprintf('FILE %s: X vs Y.fig', FILE_NAME))

[Image Analyst]

I'd recommend saving them as PNG files with exportgraphics() or saveas() or export_fig().

Answer 1

[Star Strider]

You’re almost there!

Add a sprintf call and it does what you want:

title(sprintf('FILE %s: X vs Y (dB Mag)', FILE_NAME))

and:

savefig(sprintf('FILE %s: X vs Y.fig', FILE_NAME))

I tested the title call. Since I don’t want to write the file to my computer, I didn’t test the savefig call. It should work. (It would likely help to include the figure handle as the first argument in the savefig call, just to be certain it’s doing what you want it to, although that’s snot required.)

.

[Keith Grey]

Title worked, but savefig didn't. I implemented it as you've shown, but it gave the error:

Error using save

Unable to open file "FILE_NAME.fig" for output.

Error in matlab.graphics.internal.figfile.FigFile/write (line 32)

save(obj.Path, obj.MatVersion, '-struct', 'SaveVars');

Error in savefig (line 84)

FF.write();

[Star Strider]

If you are using a Windows system, the colon (:) is likelly the problem.

Substitute the colon with something that Windows doesn’t have a problem with, such as a minus sign:

savefig(sprintf('FILE %s - X vs Y.fig', FILE_NAME))

That worked when I tried it.

[Keith Grey]

That did it! Thank you very much for your help!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.

Answer 2

[Image Analyst]

Try

FILE_NAME = '1.A.A';
hFig = figure; % Bring up a new figure, or hFig = gcf to get an existing figure handle.
hFig.Name = sprintf('%s', FILE_NAME); % or hFig.Name = 'Figure 1' or whatever
hFig.NumberTitle = 'off'; % No "Figure 1" in the title bar.
hFig.WindowState = 'maximized' % Maximize the figure window.
% Plot something...
plot(X, Y, 'LineWidth', 1)
caption = sprintf('FILE %s: X vs Y (dB Mag)', FILE_NAME);
title(caption, 'FontSize', 20);
% Prepare PNG filename:
baseFileName = sprintf('%s.png', FILE_NAME); % Tack on png extension so oeprating system will recognize it.
% folder can be pwd or wherever you want it to go.
folder = pwd; % current folder, or use 'D:\my images\' or wherever...
fullFileName = fullfile(folder, baseFileName); 
% Save image to disk:
saveas(hFig, fullFileName); % Save to disk as a PNG format image.