Plot a vector field from a matrix
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I would like to plot a field of unit vectors on a square lattice Λ of size 
.
.Each point of the lattice is a unit vector pointing in some angle: 
where θ is a matrix whose entries are between 0 and 
.
where θ is a matrix whose entries are between 0 and .Here is my attempt:
N=100
theta=2*pi*rand(N,N) % random for this example only
[X,Y]=meshgrid(1:N,1:N)
U=cos(theta)
V=sin(theta)
quiver(X,Y,U,V)
However this is not very esthetic, how could I make this vector field more readable?
(Even when I choose a configuration where all spins are aligned, it is still not readable)
Perhaps spacing the arrows and making them bigger with a longer shaft could make it more readable? I am quite new on MATLAB and I have no idea how to change this. Plotting this from my matrix theta felt already like an accomplishement.
Thank you for your help and your time.
采纳的回答
Asad (Mehrzad) Khoddam
2020-12-15
You can use a scale like this:
N=100;
theta=2*pi*rand(N,N); % random for this example only
[X,Y]=meshgrid(1:N,1:N);
U=cos(theta);
V=sin(theta);
quiver(X,Y,U,V,0.3)
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