Connect the dots with a loop

Question

arnaud ensberg 2015-4-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214287-connect-the-dots-with-a-loop

评论： arnaud ensberg 2015-4-30

采纳的回答： Image Analyst

在 MATLAB Online 中打开

Hi I have a point cloud :

point_cloud = [-1,0; 1,0; 1,2; -1,2; 0,3];

that I want connect according to two vectors :

k=[1  5     5     3     4]
l=[3  4     3     5     5]

it means : the first point is connected with the third, the fifth with the fourth

Here is my loop:

cc=point_cloud(:,1)
ll=point_cloud(:,2)
for m=1:size(k,1)  
  plot([point_cloud(k(m),1) point_cloud(l(m),1)],[point_cloud(k(m),2) point_cloud(l(m),2)])
  hold on
end
plot(cc,ll,'r*')
hold off

but it draws only one segment

can you help me please

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Answer 1

Image Analyst 2015-4-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214287-connect-the-dots-with-a-loop#answer_177182

In the first plot(), inside the loop, you need to tell it to do lines, like plot(....., 'r*-')

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Image Analyst 2015-4-29

在 MATLAB Online 中打开

Try this:

point_cloud = [-1,0; 1,0; 1,2; -1,2; 0,3]
k=[1 5 5 3 4]
l=[3 4 3 5 5]
x=point_cloud(:,1)
y=point_cloud(:,2)
for m = 1 : length(k)
  index1 = k(m)
  index2 = l(m)
  plot([x(index1), x(index2)],[y(index1), y(index2)], 'r*-', 'LineWidth', 2)
  hold on
end
grid on;
hold off