I think i have problem with pause command
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Hello dudes, i make a small animation on matlab about a body that start from Y=0 with initial velocity. My problem is that on the paper maths shows that the total time of the animation will be 4sec but when i run the programm does seem to be same running time. I think that my error is on the pause command but i can't solve it
tspan =0:0.01:4;
y0 = 0;
[t,y] = ode45(@(t,y) -10*t+20, tspan, y0);
plot(t,y)
grid on
x1=[0, 0, 1, 1];
y1=[0, 0.5, 0.5, 0];
x2=[0, 0, 10, 10];
y2=[0, 0.01, 0.01, 0];
fill(x2,y2,'black');
hold on
axis([0 10 -5 25])
grid on
time=0
z=1
while time<=400
time=time+1;
ypsos=y(z)
p=fill(x1,y1+ypsos,[0 0.41 0.53])
pause(0.009)
drawnow
delete(p);
z=z+1;
end
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채택된 답변
Walter Roberson
2020년 10월 8일
It is not obvious that you are filling the area that you would want to fill, but this at least finished quickly enough.
tspan =0:0.01:4;
y0 = 0;
[t,y] = ode45(@(t,y) -10*t+20, tspan, y0);
plot(t,y);
axis([0 10 -5 25])
grid on
hold on
drawnow();
x1=[0, 0, 1, 1];
y1=[0, 0.5, 0.5, 0];
x2=[0, 0, 10, 10];
y2=[0, 0.01, 0.01, 0];
fill(x2,y2,'black');
grid on
for time = 1 : 400
ypsos=y(time);
p=fill(x1,y1+ypsos,[0 0.41 0.53]);
pause(0.009)
drawnow
delete(p);
end
댓글 수: 2
Walter Roberson
2020년 10월 9일
If the idea is "real time" animation, then:
start = tic;
for time = 1 : 400
ypsos=y(time);
p=fill(x1,y1+ypsos,[0 0.41 0.53]);
if time ~= 400
pause(y(time+1) - toc(start));
end
delete(p);
end
Outputs will tend to be slightly late, but there should not be any cumulative drift as the time is compared to the start time rather than assuming that we started this round on time.
Walter Roberson
2020년 10월 9일
cla reset
tspan =0:0.01:4;
y0 = 0;
[t,y] = ode45(@(t,y) -10*t+20, tspan, y0);
plot(t,y)
grid on
x1=[0, 0, 1, 1];
y1=[0, 0.5, 0.5, 0];
x2=[0, 0, 10, 10];
y2=[0, 0.01, 0.01, 0];
fill(x2,y2,'black');
hold on
axis([0 10 -5 25])
grid on
start = tic;
p = fill(x1, y1, [0 0.41 0.53]);
for time = 1 : 400
ypsos=y(time);
p.YData = y1+ypsos;
pause(t(time+1)-toc(start));
end
toc(start)
추가 답변 (2개)
Luciano Garim
2020년 10월 8일
To solve your problem, you may use the conditional command "if" and "return". Try to execute this code now.
tspan =0:0.01:4;
y0 = 0;
[t,y] = ode45(@(t,y) -10*t+20, tspan, y0);
plot(t,y)
grid on
x1=[0, 0, 1, 1];
y1=[0, 0.5, 0.5, 0];
x2=[0, 0, 10, 10];
y2=[0, 0.01, 0.01, 0];
fill(x2,y2,'black');
hold on
axis([0 10 -5 25])
grid on
time=0
z=1
while time<=1000
time=time+1;
if time>400
return;
end
ypsos=y(z)
p=fill(x1,y1+ypsos,[0 0.41 0.53])
pause(0.009)
drawnow
delete(p);
z=z+1;
end
I hope helped you!
댓글 수: 1
Walter Roberson
2020년 10월 8일
return is not needed. If you want to stop at 400, just change the while limit. if / return approach here has nothing to recommend it over the approach the original person used.
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