The code runs, but imediately deletes the animation and does not update

Question

Matthew Palermo 2019-12-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495054-the-code-runs-but-imediately-deletes-the-animation-and-does-not-update

关闭： MATLAB Answer Bot 2021-8-20

I am modeling a knuckle-link linkage system with a crank-slider and I am trying to get this animated plot for velocity and to show the motion. The code runs and gives the inital positions of everything, but then it deletes itself and does not update the positions.

clear

clc

A = 8.25; %in

B = 48;

C = 42;

D = 20;

t = 0:0.01:20; %sec

omega = 5.0265; %rad/sec

theta = omega*t;

phi = cot(theta);

P1_pos = [56.25;43.1];

P2_pos = [56.25-A*cos(theta);43.1-A*sin(theta)];

P4_pos = C*[0;1];

P5_pos = [0*sin(theta);-D*cos(phi)]; %P5_pos = D*[0;-1+sin(theta)];

P3_pos = [sin(phi);cos(phi)]; %P3_pos = [C + B*cos(a+b); B*sin(a+b)];

P5x = P5_pos(1,:);

P5y = P5_pos(:,1);

P5vx = diff(P5x);

P5vy = diff(P5y);

P5v = sqrt(P5vx.^2 + P5vy.^2);

for i = length(t)

ani = subplot(2,1,1);

P1_pos_cir = viscircles(P1_pos',0.05);

P2_pos_cir = viscircles(P2_pos(:,i)',0.05);

P3_pos_cir = viscircles(P3_pos(:,i)',0.05); %P3_pos_cir = viscircles(P3_pos(:,i)',0.05);

P4_pos_cir = viscircles(P4_pos',0.05);

P5_pos_cir = viscircles(P5_pos(:,i)',0.05);

barA = line([P1_pos(1) P2_pos(1,i)],[P1_pos(2) P2_pos(2,i)]);

barB = line([P2_pos(1,i) P3_pos(1,i)],[P2_pos(2,i) P3_pos(2,i)]);

barC = line([P4_pos(1) P3_pos(1,i)],[P4_pos(2) P3_pos(2,i)]);

barD = line([P5_pos(1,i) P3_pos(1,i)],[P5_pos(2,i) P3_pos(2,i)]);

axis(ani,'equal');

set(gca,'XLim',[-10 60],'YLim',[-30 60]);

str1 = 'P5';

P5_text = text(P5_pos(1,i),P5_pos(2,i)+0.4,str1);

pause(0.001);

delete(P1_pos_cir);

delete(P2_pos_cir);

delete(P3_pos_cir);

delete(P4_pos_cir);

delete(P5_pos_cir);

delete(barA);

delete(barB);

delete(barC);

delete(barD);

delete(P5_text);

% vel = subplot(2,1,2);

% plot(vel,t(1:i),P5v(1:i));

% set(vel,'XLim',[0 50], 'YLim',[0 10]);

% xlabel(vel,'time(s)');

% ylabel(vel,'Velocity of Press Block');

% grid on;

end

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Adam 2019-12-5

You seem to be explicitly telling it to delete everything!

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Answer 1

Jeremy 2019-12-5

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495054-the-code-runs-but-imediately-deletes-the-animation-and-does-not-update#answer_404984

在 MATLAB Online 中打开

    delete(P1_pos_cir);
    delete(P2_pos_cir);
    delete(P3_pos_cir);
    delete(P4_pos_cir);
    delete(P5_pos_cir);
    delete(barA);
    delete(barB);
    delete(barC);
    delete(barD);
    delete(P5_text);