How to set colors in quiver (2D)?

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noa 2012-9-20

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评论： Jean 2015-8-25

Hi, im using the quiver function to plot arrows on a profile

so i want that the arrows which are turning inwards to be colored in a different color (blue). Also, i have a vector telling me which of them is turning inwards.

how can i do that?

thanks, Noa

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José-Luis 2012-9-20

I see you decided to go with the quiver suggestion. If an answer has helped you, please accept it.

noa 2012-9-20

:)

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Answer 1

Wayne King 2012-9-20

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编辑：Wayne King 2012-9-20

在 MATLAB Online 中打开

I would separate the elements which are turning inward vs outward since you have a vector of indices and use two different calls to quiver() with the plot held on.

Then you can use

quiver(x,y,px,py,'color',[0 0 1])

In other words, use the 'color' linespec to color them blue. For example:

 [x,y] = meshgrid(-2:.2:2,-1:.15:1);
 z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
 contour(x,y,z), hold on
 indices = 11:21;
    quiver(x(:,indices),y(:,indices),px(:,indices),py(:,indices),'color',[0 0 1]);
quiver(x(:,1:10),y(:,1:10),px(:,1:10),py(:,1:10),'color',[1 0 0]);