Can't delete Plot line

Question

Oguz Han Yesildal 2019-4-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458084-can-t-delete-plot-line

回答： Walter Roberson 2019-4-23

Hi guys i need some help with my code. im trying to delete a plot line but mathlab doesnt let me.

if ventilst== 1
    %Weißer Hintergrund
    xbodenw1 = [-500 -500 -498 -498];
    ybodenw1 = [-115 -815 -815 -115];
    p1= plot([-9735 -375], [-875 -875], 'k');
    assignin('base','p1',p1);
    p2= evalin('base','p2');
        delete(p2)
end
if ventilst== 0
    p2= plot([9735 -375], [-875 -875], 'k');
    assignin('base','p2',p2);
    p1= evalin('base','p1');
    delete(p1)
end

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Answer 1

Walter Roberson 2019-4-23

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458084-can-t-delete-plot-line#answer_371930

在 MATLAB Online 中打开

You have no hold on in what you show. When hold is not on (or equivalent internal settings) then each plot() call effectively calls cla() before doing the plotting, which would have the effect of deleting the existing line.

Try

if ishandle(p2); delete(p2); end