How to get quiver plot with gradient color

clc
clear;
sys = @(~,x) [-3*x(1)+3*x(2);-2*x(1)+x(2)];
syms r j
space = 1.5;
[r,j] = meshgrid(-4:space:4,-4:space:4);
dr = -3*r + 3*j;
dj = -2*r + j;
drn = dr./sqrt(dr.^2+dj.^2);
djn = dj./sqrt(dr.^2+dj.^2);
q = quiver(r,j,drn,djn,0.5);

How could i change the color of this quiver plot to gradient color like this

Thanks alot <3

Answer 1

[DGM]

This isn't something that can be done directly with the quiver object.

There is a FEX tool that can do a colormapped quiver plot. That may work depending on your needs.

https://www.mathworks.com/matlabcentral/fileexchange/17582-ncquiverref

There are also these much older tools, but they may have problems in current MATLAB versions. I have not tested them, but they all predate R2014x.

https://www.mathworks.com/matlabcentral/fileexchange/3225-quiverc

https://www.mathworks.com/matlabcentral/fileexchange/7180-quiverc2wcmap

https://www.mathworks.com/matlabcentral/fileexchange/31480-quiverc-m-updated-with-new-features