How to plot from a specific point?

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Patricio Flores García
评论： Sam Chak 2024-3-7
Hello, I have a rather simple issue that I can't seem to figure out. I have a vector
Vector=[20;50;0];
Which I'd like to plot from this point
Traslacion=[10;-15;10];
Yet I don't know if there's an option for this. Any help would be appreciated
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Patricio Flores García
Patricio Flores García 2024-3-7
No, I have a vector from the origin to the point I wish to trace, that being [20; 50 ; 0]
I want to move the origin of the vecotr [10 ; -15 ; 10] and have it respect the original vector's properties
Sam Chak
Sam Chak 2024-3-7
Hi @Patricio Flores García, Can you sketch on a piece of paper, or use your PC or smartphone to edit the image by drawing the desired vector?

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回答（2 个）

Voss
Voss 2024-3-7
Ran in:
Vector=[20;50;0];
Traslacion=[10;-15;10];
XYZ = [Vector,Traslacion];
plot3(XYZ(1,:),XYZ(2,:),XYZ(3,:),'r','LineWidth',3)
box on
grid on
view(-31,35)
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Patricio Flores García
Patricio Flores García 2024-3-7
Should I maybe move the axis to the point I want to plot from?
Voss
Voss 2024-3-7
编辑：Voss 2024-3-7
Ran in:
Vector=[20;50;0];
Traslacion=[10;-15;10];
Like this?
figure();
XYZ = Vector+[[0;0;0] Traslacion];
plot3(XYZ(1,:),XYZ(2,:),XYZ(3,:),'r','LineWidth',3)
box on
grid on
view(-31,35)
Or this?
figure();
XYZ = Traslacion+[[0;0;0] Vector];
plot3(XYZ(1,:),XYZ(2,:),XYZ(3,:),'r','LineWidth',3)
box on
grid on
view(-31,35)

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Fangjun Jiang
Fangjun Jiang 2024-3-7
编辑：Fangjun Jiang 2024-3-7
Ran in:
Use line(), you need to put the data in the right format. See help document
Vector=[20;50;0];
Traslacion=[10;-15;10];
d=[Traslacion Vector]
d = 3×2
10 20 -15 50 10 0
line(d(1,:),d(2,:),d(3,:))
view(3);grid on;
  2 个评论
Patricio Flores García
Patricio Flores García 2024-3-7
Ran in:
Hello, sorry, I think I wasn't descriptive enough in my initial question. The main issue is that the original vector's properties (when tracing from the origin to its endpoint) are not respected when trying to displace it:
Vector=[20;50;0];
x_original=[0 Vector(1,1)];
y_original=[0 Vector(2,1)];
z_original=[0 Vector(3,1)];
Traslacion=[10;-15;10];
plot3(x_original,y_original,z_original,'LineWidth',2,'Color','k')
grid on
hold on
d=[Traslacion Vector]
d = 3×2
10 20 -15 50 10 0
line(d(1,:),d(2,:),d(3,:))
Fangjun Jiang
Fangjun Jiang 2024-3-7
Ran in:
Vector=[20;50;0];
Traslacion=[10;-15;10];
d=[zeros(3,1),Traslacion, Vector];
line(d(1,:),d(2,:),d(3,:))
view(3);grid on;

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