Plotting X, Y cordintions with a line short line that indicates the angle
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Ahmed Madhun
le 4 Sep 2019
Commenté : Ahmed Madhun
le 5 Sep 2019
I have a Matrix (M) that looks like this:
X Y Angle
20 30 200
30 100 100
80 450 50
How can i plot a point for each raw as a coordinate? and a short line that indicates the angle/diraction this node is facing.
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Réponse acceptée
Kelly Kearney
le 4 Sep 2019
With quiver, the u and v arguments represent the horizontal and vertical components of the arrow you want to draw. You can calculate those easily based on the angle:
dat =[...
20 30 200
30 100 100
80 450 50];
u = cosd(dat(:,3));
v = sind(dat(:,3));
plot(dat(:,1), dat(:,2), 'o');
hold on;
s = 0.1; % scaling factor, adjust as desired
quiver(dat(:,1), dat(:,2), u, v, s);
axis equal;
Plus de réponses (1)
Neuropragmatist
le 4 Sep 2019
Modifié(e) : Neuropragmatist
le 4 Sep 2019
Your question is lacking some detail I suspect. Just to plot the XY data you could do this:
dat =[20 30 200
30 100 100
80 450 50];
figure
plot(dat(:,1),dat(:,2))
But my guess is that you are asking how you can plot lines starting at the XY coordinates with the angles listed in the third column? To do that you will have to choose a length of the lines and then you can do something like this:
% use dat from above
L = 100;
x2 = dat(:,1) + (L .* cosd(dat(:,3))); % use trigonometry to work out position of line 100 units from the starting point
y2 = dat(:,2) + (L .* sind(dat(:,3)));
figure
plot([dat(:,1) x2]',[dat(:,2) y2]')
daspect([1 1 1])
Hope this helps,
M.
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