refreshdata, drawnow, ... nothing works?

Question

Vinci 2013-10-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104174-refreshdata-drawnow-nothing-works

回答： Vinci 2013-10-29

Good evening

I'm currently working on a project where data from an embedded platform is fed into matlab in a loop. Some stuff gets calculated and plotted with the drawVector3d function from the famous geom3d lib (<http://www.mathworks.com/matlabcentral/fileexchange/24484-geom3d)>. It's basically just a nicer wrap for quiver3, but it makes my code way more readable...

The code with the actual plot looks like this:

if true
drawVector3d([0 0 0],R(1,:));
drawVector3d([0 0 0],R(2,:));
drawVector3d([0 0 0],R(3,:));
axis vis3d
axis([-1 1 -1 1 -1 1])
set(gca, 'YDir', 'reverse')
set(gca, 'ZDir', 'reverse')
hold;
end

Now the matrix "R" changes with each loop and I'd like to update my quiver3 plot accordingly. So far I've tried pretty much every combination I got from google, like refreshdata, drawnow or linkdata... but nothing worked.

I'd really appreciate it, if someone has a suggestion for me.

tia Vinci

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Sean de Wolski 2013-10-28

How are you calling linkdata?

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Answer 1

Vinci 2013-10-29

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/104174-refreshdata-drawnow-nothing-works#answer_113563

在 MATLAB Online 中打开

Hey there

Actually, I just figured it out! I didn't know that you can link U,V and W data from the quiver3 plot as well...

So at first I always had my vectors drawn from the endpoint from the previous vector to a new position instead of from the origin to the new position. Looking up the quivergroup properties helped (<http://www.mathworks.de/de/help/matlab/ref/quivergroupproperties.html)>!

if true
set(h1, 'XDataSource', '0', 'YDataSource', '0', 'ZDataSource', '0');
set(h2, 'XDataSource', '0', 'YDataSource', '0', 'ZDataSource', '0');
set(h3, 'XDataSource', '0', 'YDataSource', '0', 'ZDataSource', '0');
set(h1, 'UDataSource', 'r(1,1)', 'VDataSource', 'r(1,2)', 'WDataSource', 'r(1,3)');
set(h2, 'UDataSource', 'r(2,1)', 'VDataSource', 'r(2,2)', 'WDataSource', 'r(2,3)');
set(h3, 'UDataSource', 'r(3,1)', 'VDataSource', 'r(3,2)', 'WDataSource', 'r(3,3)');
linkdata on
end