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

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Matthew Palermo
Matthew Palermo 2019-12-5
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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回答（1 个）

Jeremy
Jeremy 2019-12-5
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);
I think this needs to be moved outside the for loop

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