plot the recent data with drawnow in level-2 matlab file s-function

Hello,

I plot a flat surface and rotate it with "drawnow" in a figure. I used to do this in a "level-2 matlab file s-function" for my Simulink simulation. It works in principal , but the figure updates the recent plot every t_out. It is like I would use the "hold on" command in a normal script. After some time its just a cylinder because Matlab saves every plot. How can I get only the recent plot in the figure, like a flat surf who rotates ?

Answer 1

[majety]

You can number the figure as figure(1) and keep plotting your circle to the same figure. Make sure you get the length of your axes right so that the animation looks good. Also remember that you can use "hold off" if you don't want a cylinder from your piled up circles.

Example:

for theta =  0:pi/50:2*pi;
x =  20 *cos(theta);
y =  20*sin(theta);
originx = 0;
originy = 0;
pause(0.01);figure(1);
plot([x,originx],[y,originy],'b','LineWidth',2);hold on; 
plot(x,y,'k+','LineWidth',2);hold off;
xlim([-30,30]);ylim([-30,30]);
end

[Benutzer Name]

I tried it with my code but it doesn't work. You see the what's wrong?!

for x=0:pi/160:pi
pts = [4  -4  -4  4 ; 
       4  4  -4  -4 ; 
       0  0  0  0 ; 
       1  1  1  1 ];
axis equal
xlim([-10 10])
ylim([-10 10])
zlim([-10 10])
pause(0.01)
figure(1)
h1 = patch('FaceColor',[0.3010 0.7450 0.9330]);hold on;
h1.XData = pts(1,:) ./ pts(4,:);
h1.YData = pts(2,:) ./ pts(4,:);
h1.ZData = pts(3,:) ./ pts(4,:);
set(gca,'view',[30 30])
mrot = makehgtform('xrotate',x,'yrotate',0,'zrotate',0)
p2 = mrot*pts;
h2 = patch('FaceColor',[0.9290 0.6940 0.1250]);hold off;
h2.XData = p2(1,:) ./ p2(4,:);
h2.YData = p2(2,:) ./ p2(4,:);
h2.ZData = p2(3,:) ./ p2(4,:);
end

[majety]

try to add 'clf', so that it clears your figure before you plot over it again.

pause(0.01);figure(1);clf;