how not to delete one figure using clf?

Question

Sierra 2022-12-26

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https://ww2.mathworks.cn/matlabcentral/answers/1884727-how-not-to-delete-one-figure-using-clf

回答： Jan 2022-12-26

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I want to plot animation with a background image.

but for animation, i used clf in for loop.

so the backgorund image is deleted because of clf.

here is my code.

    open('example.fig')
 for i = 1:length(TX)
     clf
    plot3(TX(1,i),TX(2,i),TX(3,i),'o','markerfacecolor','r','markersize',10,'markeredgecolor','k');
    hold on
    VVS = VV{i};
    VV_lon = VVS(1,:);
    VV_lat = VVS(2,:);
    VV_alt = VVS(3,:);
    plot3(VV_lon,VV_lat,VV_alt,'b--')
        
        drawnow; pause(0.1)
 end     

thanks.

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Voss 2022-12-26

Does removing clf produce the desired result? If not, how not?

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Answer 1

Jan 2022-12-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1884727-how-not-to-delete-one-figure-using-clf#answer_1136537

在 MATLAB Online 中打开

clf clears the contents of the current figure. If you do not want this, remove clf.

Maybe all you want is to clear the current axes. Then use gca instead. This causes some flickering. Animating objects is smoother, if they are not created repeatedly, but the values are adjusted.

axesH = axes('NextPlot', 'add');  % as: hold on
H1    = plot3(TX(1,1), TX(2,1), TX(3,1), 'o', ...
              'markerfacecolor','r','markersize',10,'markeredgecolor','k');
for i = 1:length(TX)
   pause(0.1);  % No additional drawnow required
   set(H1, 'XData', TX(1,1), 'YData', TX(2,1), 'ZData', TX(3,1));
end