# How to make color magnitude by quiver plot?

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Masoud Taleb on 14 Oct 2020
Edited: Masoud Taleb on 14 Oct 2020
Hello
I have a problem with quiver plot. My code makes the plot perfectly but I would like to have also color magnitude on it. I mean the electric field can be observed by color change when arrow rotates. I appreiate all the helps in this regard. My code and sample date is below:
clc
clear all
theta = Ex(2:end, 1);
phi = Ex(1, 2:end);
data_x = Ex(2:end,2:end);
data_x = transpose(data_x);
% data_x = max(data,0);
data_y = Ey(2:end,2:end);
data_y = transpose(data_y);
% data_y = max(data,0);
[theta_,phi_]= meshgrid(theta,phi);
r=1e-3;
x=r*sin(theta_).*cos(phi_);
y=r*sin(theta_).*sin(phi_);
z=r*cos(phi_);
quiver(x,y,data_x,data_y);
% xlabel('x');
% ylabel('y');
set(gca,'XDir','reverse');
set(gca,'DataAspectRatio',[10 10 10])
camroll(-90)

KSSV on 14 Oct 2020
##### 3 CommentsShow 1 older commentHide 1 older comment
KSSV on 14 Oct 2020
What errors you getting?
Masoud Taleb on 14 Oct 2020
Edited: Masoud Taleb on 14 Oct 2020
First link stays in play mode and does not give any plot at all (I stayed 20 min without getting response)
Second link shows following error. I tried to fix it but was not successful.
Unrecognized function or variable 'samesize'.
Error in quiverc (line 129)
if ~isempty(samesize)
Error in Untitled (line 20)
quiverc(x,y,data_x,data_y);
Third link brings a ghraph which is totally something else.