Arrow lengths don't represent the ratio of velocities for 2 Quiver Plots
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PASUNURU SAI VINEETH
il 27 Mag 2023
Commentato: PASUNURU SAI VINEETH
il 28 Mag 2023
I have plotted two sets of velocity data for the same position data in a single quiver plot.
figure
quiver(xposition,yposition,uvelocity,vvelocity,'b')
hold on
quiver(xposition,yposition,v2dprime(1,:)',v2dprime(2,:)','r')
axis equal
But, visually from Figure 1, the length of arrows of the second dataset (red) is huge in comparison to the first dataset (blue). This is happening despite the actual velocities being comparable or in some cases, uvelocity(vvelocity) being greater than v2dprime. I would like the length of vectors originating at every point to represent the actual ratio of velocities. If I turn the scaling off, the first dataset (blue) is weirdly magnified as in Figure 2.
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VBBV
il 27 Mag 2023
D = load('Data.mat');
figure
quiver(D.xposition,D.yposition,D.uvelocity,D.vvelocity,'b','AutoScaleFactor',2.5)
hold on
quiver(D.xposition,D.yposition,D.v2dprime(1,:)',D.v2dprime(3,:)','r')
% axis equal
2 Commenti
VBBV
il 27 Mag 2023
If you use AutoScaleFactor, property you can set the arrow lengths according to red color graph,
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鑫源
il 27 Mag 2023
plot the histogram, you 'll find the blue one in fact exists a few exaggeratedly large vecs. Though average length of the blue one and the red are comparalbe. I think that's the problem
C={[uvelocity, vvelocity],[v2dprime(1,:)',v2dprime(2,:)'],}
D=cellfun(@(x)vecnorm(x,2,2),C,UniformOutput=false);
>> histogram(D{1})
>> histogram(D{2})
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