draw two 3D curve but can't hold them in one figure
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the first curve is a solution of a differential equation
function dy=eq3(t,y)
dy=zeros(3,1);
dy(1)=-680*(y(1)-100000)/sqrt((y(1)-100000)^2+(y(2)-340*t)^2+(y(3)-10000)^2);
dy(2)=-680*(y(2)-340*t)/sqrt((y(1)-100000)^2+(y(2)-340*t)^2+(y(3)-10000)^2);
dy(3)=-680*(y(3)-10000)/sqrt((y(1)-100000)^2+(y(2)-340*t)^2+(y(3)-10000)^2);
end
and the second one is a line in a 3Dspace
[t,y]=ode45('eq3',[0:0.01:202],[0,0,0]);
plot3(y(:,1),y(:,2),y(:,3))
grid on
hold on
T=0:0.5:200;
X=100000;
Y=340*T;
Z=10000;
plot3(X,Y,Z,'r')
xlabel('x轴')
ylabel('y轴')
zlabel('z轴')
but they don't show up together
回答（1 个）
Aniruddha Katre
2014-8-20
The reason why the second plot does not show up is because the variables "X" and "Z" are both scalars while "Y" is a vector. You can just convert "X" and "Z" to vectors of the same dimensions as "Y" and the plot should work. Assuming you want to keep "X" and "Z" constant, you can convert them to vectors in the following manner:
X=100000*ones(length(T),1);
Z=10000*ones(length(T),1);
2 个评论
Gary
2014-8-20
Image Analyst
2014-8-20
You can "thank" him by officially "Accepting" his answer. It will give him reputation points.
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2014-8-20
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