In Matlab how do I change the arrow head style in quiver plot?

Question

I would like to change the default arrow head style in quiver plot. How can I change it?

Answer 1

The file refresh.m located in folder ...\MATLAB\...\toolbox\matlab\specgraph\@specgraph\@quivergroup\@quivergroup contains the following lines:

%// Arrow head parameters
alpha = .33;  %// Size of arrow head relative to the length of the vector
beta = .25;  %// Width of the base of the arrow head relative to the length

Changing the values of alpha and beta achieves the desired effect.

However, this entails modifying Matlab's files, and thus it's not recommended. If you do it, keep a copy of the original refresh.m file.

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Results using the example code that appears in quiver's help:

[x,y] = meshgrid(-2:.2:2,-1:.15:1);
z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
quiver(x,y,px,py), hold off, axis image

• With original parameters (alpha = .33; beta = .25;):

  

• With alpha = .5; beta = .5;: