MATLAB Answers

0

Scatter plot with extra features

Asked by BeeTiaw on 13 Mar 2019
Latest activity Commented on by BeeTiaw on 19 Mar 2019
Hi expert,
I want to create a scatter plot where each individual points have one extra information which I also want to plot, i.e. their azimuth.
The data is shown below
data=[
% Temp Pres Azim
41 78 45
66 44 0
170 66 120
136 27 100
137 52 110];
The azimuth listed in the third column of the data is measured from the top of each data points (or circle) clockwise from [0,360deg].
How do I do this? The following plot has been generated manually by adding the blue line that shows the azimuth of each points.
Picture3.png
Thank you!

  0 Comments

Sign in to comment.

2 Answers

Answer by Guillaume
on 13 Mar 2019
 Accepted Answer

halflength = 2;
scatter(data(:, 1), data(:, 2), 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'r')
for row = 1:size(data, 1)
line(data(row, 1) + sind(data(row, 3)) * [-halflength, halflength], ...
data(row, 2) + cosd(data(row, 3)) * [-halflength, halflength], ...
'Color', 'b');
end

  4 Comments

Show 1 older comment
Akira Agata
on 13 Mar 2019
+1
I think you need to add 'daspect([1 1 1])' to show the angle correctly in the figure.
Guillaume
on 14 Mar 2019
Indeed, make sure the aspect ratio is is the same on both axis.
BeeTiaw on 19 Mar 2019
Thanks @Akira Agata!

Sign in to comment.


Answer by Akira Agata
on 13 Mar 2019

How about using quiver function? Here is an example.
data = [
% Temp Pres Azim
41 78 45
66 44 0
170 66 120
136 27 100
137 52 110];
u = 10*sind(data(:,3));
v = 10*cosd(data(:,3));
figure
scatter(data(:,1),data(:,2))
hold on
quiver(data(:,1)-u/2,data(:,2)-v/2,u,v,'AutoScale','off')
daspect([1 1 1])
xlabel('Temp','FontSize',12)
ylabel('Pres','FontSize',12)
box on
grid on
quiver.png

  0 Comments

Sign in to comment.