Add arrows to a graph

Hi,

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

Answer 1

[Mischa Kim]

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.

[JMS]

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!

Answer 2

[Joseph Cheng]

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.

[Joseph Cheng]

http://www.mathworks.com/help/matlab/creating_plots/how-to-annotate-graphs.html

The link above should contain all the information you need about annotating graphs in matlab.