How to plot a trajectory with varying colour?
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I'm trying to plot the trajectory which also shows error characteristics visually.
Inputs: East(m), North(m), error(m)
error = sqrt((East_radar - North_GPS)^2 + (East_GPS - North_GPS)^2)
At present, I'm able to plot trajectory, with the marker indices representing the points where the error is high. I have implemented the code as seen below.
To make this visualization better, how can I represent the trajectory with varying colour representing error value? as shown below.
So, higherror represents Red and low error represents Green? Your assistance would relly help me.Thanks!
If my query is unclear, please revert.
figure()
plot(Radar_East, Radar_North,'LineStyle','-')
xlabel('East (m)')
ylabel('North (m)')
title('GPS EN plot')
hold on
plot(Radar_East(outliers),Radar_North(outliers),'o','MarkerSize',8);
legend('RADAR Trajectory','Outliers > 99 percentile')
hold off
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Réponse acceptée
Voss
le 23 Fév 2023
"I'm trying to assign an independent variable to a data point in 2D through colour."
You can choose any colour(s) you like.
Examples:
x = linspace(0,2*pi);
y = sin(x);
subplot(3,2,1)
c = x;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = x')
subplot(3,2,2)
c = y;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = y')
subplot(3,2,3)
c = cos(x);
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = cos(x)')
subplot(3,2,4)
c = y.^2;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = y^2')
subplot(3,2,5)
c = x.^2-4*pi^2*y.^2;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = x^2-4*pi^2*y^2')
subplot(3,2,6)
c = rand(size(x));
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = random')
figure
colormap(copper())
subplot(3,2,1)
c = x;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = x')
subplot(3,2,2)
c = y;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = y')
subplot(3,2,3)
c = cos(x);
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = cos(x)')
subplot(3,2,4)
c = y.^2;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = y^2')
subplot(3,2,5)
c = x.^2-4*pi^2*y.^2;
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = x^2-4*pi^2*y^2')
subplot(3,2,6)
c = rand(size(x));
surface([x;x],[y;y],[c;c],'FaceColor','none','EdgeColor','interp','LineWidth',2);
title('color = random')
4 commentaires
Plus de réponses (2)
Cameron
le 23 Fév 2023
Modifié(e) : Cameron
le 23 Fév 2023
I don't think there is a way to do this using just one plot. My quick solution would be to do something like this
x = 0:0.05:2*pi; %sample x data
y = sin(x); %sample y data
c = hsv(length(x)); %hsv values over the length of x
hold on %hold the graph
for ii = 1:length(x)-1
plot(x(ii:ii+1),y(ii:ii+1),'-','Color',c(ii,:)) %plot
end
hold off
Not the most elegant solution, but if really want to do it, this is a way. One problem with this approach would be if you have few data points. You could spline or smooth your data though.
3 commentaires
Les Beckham
le 23 Fév 2023
Take a look at this Answer which shows a trick for doing this using surface.
5 commentaires
Les Beckham
le 24 Fév 2023
"provide more details (your data and the code you are using to plot it".
Are we supposed to guess what you are trying to plot (and how)?
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