Quiver plot arrows hidden by surface plot?

조회 수: 29 (최근 30일)
Mark Lepage
Mark Lepage 2019년 4월 24일
댓글: Star Strider 2019년 4월 25일
Hello all,
I am creating a surface plot, and plotting on top of this a quiver plot. Everything works great, however where I have large "z" values on my surface plot, the quiver arrows are being hidden by the graph.
Any ideas how to solve this? I have attached an image of my problem, look at the yellow boxes, where the quiver arrows are hidden.

채택된 답변

Star Strider
Star Strider 2019년 4월 24일
I was considering something like this:
x = linspace(-pi, pi, 20);
h = x(2)-x(1);
[X,Y] = ndgrid(x);
Z = sin(X) .* cos(Y);
[U,V] = gradient(Z,h,h);
W = zeros(size(U));
figure
surf(X, Y, Z)
hold on
quiver3(X,Y,Z, U,V,W, 0.7, 'r')
hold off
shading('interp')
grid on
view(0, 90)
All the arrows are visible because they all plot with respect to ‘Z’. The ‘W’ matrix simply makes them plot in a plane. (I made them red so they’re more visible.)
  댓글 수: 2
Mark Lepage
Mark Lepage 2019년 4월 24일
Thank you very much, this has effectively solved my problem, and produced a much nicer graph.
Could you please explain a little more how to implement the z-offset on the quiver plot.
I believe 100% that this is the problem.
I appreciate your help a lot.
Star Strider
Star Strider 2019년 4월 24일
My pleasure.
The Z-offset is simply the zeros ‘W’ matrix that effectively plots the arrows on top of the surf plot. Instead of 3D quiver arrows, the ‘W’ matrix creates the arrows as a 2D plane, however with their origins on the ‘Z’ values of the surf plot. You can see this by using the GUI (‘Tools’ -> ‘Rotate 3D’) or the view function to rotate the plot to see the arrows with respect to the ‘Z’ surface elevation. They all plot above it, regardless of where they originate.
That’s probably as well as I can explain it.

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추가 답변 (1개)

Thomas Rosin
Thomas Rosin 2019년 4월 24일
I don't think there are hidden, I just think your arrow size is too small.
The tip of the arrow scale with its length but it's a parameters you can set on the quiver function.
  댓글 수: 6
Mark Lepage
Mark Lepage 2019년 4월 25일
Just wanted to show you the improvement in my chart.
Capture.PNG
Much appreciated.
Star Strider
Star Strider 2019년 4월 25일
@Mark Lepage —
As always, my pleasure.

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