deawing 3d vector lines

how to draw a line as a vector through a point (4,3,2) with direction (4,6,1)?

Answer 1

[Sven]

Hi Eve, you can use the following to draw a line from your original point in the direction specified.

pt = [4 3 2]   % Your point
d  = [4 6 1]   % Your direction vector
twoPts = [pt; pt+d];

figure, hold on
plot3(pt(1),pt(2),pt(3),'go') % Your original pt for comparison
plot3(twoPts(:,1),twoPts(:,2),twoPts(:,3),'-b.')

Is that what you were looking for?

Answer 2

[Jan]

There are several function to draw 3D arrows in the FEX:

• http://www.mathworks.com/matlabcentral/fileexchange/14056-arrow3-version-5
• http://www.mathworks.com/matlabcentral/fileexchange/28324-3d-arrow-plot
• http://www.mathworks.com/matlabcentral/fileexchange/25372-marrow3-m-easy-to-use-3d-arrow
• http://www.mathworks.com/matlabcentral/fileexchange/278-arrow-m
• http://www.mathworks.com/matlabcentral/fileexchange/12274-3d-arrow-with-many-colorparameter-options