MATLAB App Designer: drawnow() is extremely slow

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Sam Nadjari 2019-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/492457-matlab-app-designer-drawnow-is-extremely-slow

评论： Adam Danz 2019-11-24

I'm trying to update an image window every few milliseconds in MATLAB's app designer, but the drawnow() function is working very slowly. The same code is working much more quickly outside of the app designer environment. I read this in a separate thread:

Appdesigner (or specifically UIFigure) employs a HTML/Javascript layer which is less efficient than the standard matlab figure.

And I think this may be the root of my problem. Is there a workaround? Any other way to quickly update an image window?

Thanks

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Adam Danz 2019-11-21

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drawnow() updates all existing graphics. The more graphics that exist, the more updating.

You could try setting the limit rate so that graphics are refreshed less frequently: drawnow limitrate

It's not clear why graphics need to be repeatedly updated but in some contexts, animating your data is a lot faster and cleaner with one of the animation methods such as animatedline.

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Sam Nadjari 2019-11-24

drawnow limitrate works great for my purposes. It plots every few frames acquired without significantly slowing down the program. I will also give refreshdata() a try next time I get in the lab. Thanks so much for your help.

Adam Danz 2019-11-24

Good! If setting the limitrate in drawnow works I wouldn't bother trying the refreshdata method because you'll have to do some restructuring of your code and with frame rates of up to 1000fps, I doubt it would be sufficient.

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