Normal on line

2011 7 5
1 个回答
9 次查看（30 天）

0 个投票

Hello,
I have some points with a line and i want to draw normal vectors on that points.Like if i plot these points , i want normal to be drawn on the specified points only.
chkx=[730 710 705 686 688 679 676];
chky=[547,540,543,535,544,544,551];
chkz=[1187,1176,1187,1172,1195,1200,1216];
plot3(chkx,chky,chkz,'--rs','LineWidth',2,...
'MarkerFaceColor','k',...
'MarkerEdgeColor','g',...
'MarkerSize',2)
Thanks

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Oleg Komarov
Oleg Komarov 2011-7-5
http://www.mathworks.com/matlabcentral/answers/7885-tutorial-how-to-format-your-question

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Jan
Jan 2011-7-6

0 个投票

Normal to what? Your data are points in 3D, therefore a normal needs the definition of a plane. How do you define the planes for each point?

6 个评论
显示 4更早的评论 隐藏 4更早的评论

developer
developer 2011-7-6
u can chk this figure ,i want to draw normal vectors to the specific points shown in green ,actually its not the actually but one of the scans that makes the whole plane , but to study some behaviour i want to deal each scan separately ,
http://s1204.photobucket.com/albums/bb403/attayyabkhan/?action=view&current=pic.jpg
Jan
Jan 2011-7-6
The picture shows a non-smooth line. I do not see a connection between this picture and the posted code.
It is still not clear, what "normal" means in your case. Usually "normal" means orthogonal to the slope in each point. But this is defined for smooth lines only. So please take the time to define, what you want exactly.
developer
developer 2011-7-6
the given code is an example while the picture is the real plot of my values , actually first i want to smooth this non smooth line as a smooth line like below
http://s1204.photobucket.com/albums/bb403/attayyabkhan/?action=view&current=pic2-1.jpg
as each point has x,y and z values so i want to implement some algorithm that make it smooth and then when i get the above desired result i can draw the normal on the same points to observe the change in angle of the whole line . I hope this i make it clear to some extent to u .
Jan
Jan 2011-7-6
@Developer: You speak about x,y and z values, but you show two 2D diagrams. Therefore the problem is getting less clear.
You still do not explain what the "normal" on a 3D line should be. Imagine two points in 3D and connect them by a line. Now any line orthogonal to the connection line is "normal" - but there is an infinite number of lines, because you can rotate the normal around the connection. Let me ask a 3rd and last time: In which direction do you want to let your "normals" point?
developer
developer 2011-8-10
i actually want to construct a set of vectors
that are orthogonal to the tangential plane of each surface
point they touch.
Jan
Jan 2011-8-10
How is the plane defined?

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Interpolation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by