How to plot a trajectory with varying colour?
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Maheedhar Korimi
el 23 de Feb. de 2023
Comentada: Voss
el 24 de Feb. de 2023
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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Respuesta aceptada
Voss
el 23 de Feb. de 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 comentarios
Más respuestas (2)
Cameron
el 23 de Feb. de 2023
Editada: Cameron
el 23 de Feb. de 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 comentarios
Les Beckham
el 23 de Feb. de 2023
Take a look at this Answer which shows a trick for doing this using surface.
5 comentarios
Les Beckham
el 24 de Feb. de 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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