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determine axis limits *before* plotting..?

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Brad Stiritz
Brad Stiritz on 9 Sep 2012
Hi everyone,
I need to determine the y-axis limits "before" rendering my plot, b/c the elements are rendered in a loop, one at a time. xlim() isn't any use in this case. Will I have to reverse-engineer MATLAB's algorithm, or is there another approach?
Thanks, Brad
  3 Comments
Oleg Komarov
Oleg Komarov on 9 Sep 2012
I think we might help you if you posted the code.

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Accepted Answer

Jan
Jan on 9 Sep 2012
Edited: Jan on 10 Sep 2012
Yair has explained some tricks to http://undocumentedmatlab.com/blog/plot-performance/. You can set the XLimMode of the current axes to 'fixed' and let Matlab determine the limits at the end only by resetting it to 'auto'.
[EDITED, link fixed, thanks Yair]
  3 Comments
Brad Stiritz
Brad Stiritz on 10 Sep 2012
Yair, thanks for the very helpful blog postings. Your work is greatly appreciated, as always!

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More Answers (1)

Image Analyst
Image Analyst on 9 Sep 2012
You can save the y and x limits for the current axes at any time by using the ylim and xlim functions:
% Save initial limits.
initial_ylim_values = ylim();
initial_xlim_values = xlim();
% Now plot something that will change the ylimits
plot(x, y); % Some y that will change the y limits.
after_ylim_values = ylim();
after_xlim_values = xlim();
  2 Comments
Image Analyst
Image Analyst on 9 Sep 2012
Then you need to set "hold on" and MATLAB will "lock down" all those settings and not allow subsequent plots to change them.

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