Add arrows to a graph

Question

JMS 2014-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/124844-add-arrows-to-a-graph

评论： Joseph Cheng 2014-4-7

nl-2012-04229k_0003.gif

Hi,

Can anyone please tell how can I add arrows to a graph like the attached image

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Answer 1

Mischa Kim 2014-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/124844-add-arrows-to-a-graph#answer_132600

编辑：Mischa Kim 2014-4-7

JMS, if you are talking about the vector field, use quiver. For labeling the graph you add lines (manually or in the code) and edit the properties to add arrows.

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JMS 2014-4-7

Hi Mischa Kim, Thanks for your reply. Firstly, I should asked how to get the first image without Arrows and then for the second one how? Do you know how I can color the vector field like the first image"Without arrows"? Then we can talk about the second one.

Many thanks!

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Answer 2

Joseph Cheng 2014-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/124844-add-arrows-to-a-graph#answer_132603

so to get the image without the arrows i am going to assume you have the [x,y,u,v] that will be used in quiver. as you have x,y,u, and v coordinates you can calculate the magnitude of the vector for each x,y position using u and v. then use imagesc(x,y,m) where m is the magnitude of each vector.