0 个投票

hey all
ive been trying to use the pause function in MTLAB to achieve a cool animation effect for my projectle motion code. it hasnt been working, can anyone help me out?
thanks!
clear , clc
g=9.8;
ang=input('Enter incident angle: ');
if (ang<=0)
disp('Illegal Input')
end
v=input('Enter speed(m/s): ');
if (v<=0)
disp('Illegal Input')
end
disp('enter air resistance below. If you enter 0 or a negative number, it will be automatically .5')
disp('To find the coeficient of air resistace multiply air density, drag,area times .5')
air=input('Enter air resitiance (Will otherwise be .5): ');
if air<=0,' ';
air=.5;
end
vx0=v*cosd(ang)-air*cosd(ang);%Calculation fro air resitance
vy0=v*sind(ang)-air*sind(ang);
t=(0:.01:10000);
height=vy0*t-.5*g*t.^2;
land=find(height>=0);
time=(land(end)-1)/100;
dist=vx0*time;
height2=max(height);
fprintf('Distance is %g m \n',dist);
fprintf('Max Height is %g m \n',height2);
fprintf('Time was %g sec \n ',time);
time2=t(land);
height3=height(land);
vxst=v*cosd(ang);
vyst=v*sind(ang);
heightst=vyst*t-.5*g*t.^2;
landst=find(heightst>=0);
timest=(landst(end)-1)/100;
distst=vxst*timest;
height2st=max(heightst);
time2st=t(landst);
height3st=heightst(landst);
plot(time2,height3)
hold on
plot(time2st,height3st)
xlabel('Time (Seconds)')
ylabel('Height (Meters)')

4 个评论
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darova
darova 2020-4-17
I don't see any pause buttons. You don't use for loop also. How do you want to animate without loops?
Image Analyst
Image Analyst 2020-4-17
darova: pause function, not pause button, but there is no call to pause() either. He should have a loop with a call to apuse inside the loop.
darova
darova 2020-4-17
Yes i know. But the title says button
Walter Roberson
Walter Roberson 2020-4-17
You do need a loop for animation, unless you use comet() [which uses a timer.]

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 采纳的回答

Geoff Hayes
Geoff Hayes 2020-4-21

0 个投票

Kristian - if you want to plot t versus heightst then you could add the following to the end of your code. A stepSize of 100 is used since t is a 1x100000 array.
figure;
hPlot = plot(NaN,NaN, 'b');
xlim([min(t) max(t)]);
ylim([min(heightst) max(heightst)]);
stepSize = 100;
for k = 1:stepSize:length(t)
set(hPlot, 'XData', [get(hPlot,'XData') t(k:k+stepSize-1)], 'YData', [get(hPlot,'YData') heightst(k:k+stepSize-1)]);
pause(0.001);
end

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