# Scatter plot with extra features

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BeeTiaw on 13 Mar 2019
Commented: 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. Thank you!

Guillaume on 13 Mar 2019
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

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!

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 