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Error using handle.handle/set

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Hesham Ismail
Hesham Ismail 2015-6-5
回答： Guillaume 2015-6-5
Hello,
I am trying to run this code, but I keep getting error
I am trying to have a patch updating on a background plot.
clear;clc;close all;
h.xt=patch(0,0,'b','erasemode','xor');
h.pth= plot(0,0,'k','markersize',2,'erasemode','background');
wp=[5 1;6 2;7 3]
veh=[0 -4 -4;0 -2 2];
set(h.pth,'xdata',wp(:,1),'ydata',wp(:,2),'Marker','o')
set(h.xt,'xdata',veh(1,:),'ydata',veh(2,:))

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Guillaume
Guillaume 2015-6-5
plot deletes the previous content of the figure, unless you use hold on, hence your patch handle becomes invalid as soon as you create the plot. To fix:
h.xt=patch(0,0,'b','erasemode','xor');
hold on
h.pth= plot(0,0,'k','markersize',2,'erasemode','background');

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