How to plot from a specific point?

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Patricio Flores García
Patricio Flores García on 7 Mar 2024
Commented: Sam Chak on 7 Mar 2024
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 on 7 Mar 2024
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 on 7 Mar 2024
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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Answers (2)

Voss
Voss on 7 Mar 2024
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 on 7 Mar 2024
Should I maybe move the axis to the point I want to plot from?
Voss
Voss on 7 Mar 2024
Edited: Voss on 7 Mar 2024
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 on 7 Mar 2024
Edited: Fangjun Jiang on 7 Mar 2024
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 Comments
Patricio Flores García
Patricio Flores García on 7 Mar 2024
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 on 7 Mar 2024
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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