plotting a plane in three dimensions including data points

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cgo
cgo 2017-12-7
回答： Adam Danz 2024-10-4
Hi,
I have a plane obtained via regression. Let's say this is z = 2x + 3y + 4. I want to plot this plane AND the data points. How do I do this?

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采纳的回答

Erivelton Gualter
Erivelton Gualter 2018-10-22
Run the following code:
[x y] = meshgrid(-10:1:10);
z = 2.*x + 3.*y + 4;
surf(x,y,z);
To add the data you can add the following lines:
hold on;
plot3(DataX, DataY, DataZ);
You can check the meshgrid and surf function in the following links:
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/meshgrid.shtml>
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/meshgrid.shtml

更多回答（2 个）

cui,xingxing
cui,xingxing 2022-8-25
编辑：cui,xingxing 2024-4-27
https://www.mathworks.com/matlabcentral/answers/101174-how-can-i-generate-a-plane-surface-in-matlab
repeated question.
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Adam Danz
Adam Danz 2024-10-4
Ran in:
Starting in R2024b, use the constantplane function to plot a 2D plane in 3D axes.
The ConstantPlane is defined by its normal vector and an offset value.
To plot a plane defined by z=2x+3y+4, first refactor the equation into the form ax+by+cz=d which is 2x+3y-z=-4 which defines the vector normal as [2 3 -1] and the offset as -4.
I also set the axis limits to ensure the plane is within view. Line ConstantLines (xline, yline) and ConstantRegions (xregion, yregion), the ConstantPlane extends infinitely in all dimensions.
cp = constantplane([2 3 -1], -4)
cp =
ConstantPlane with properties: NormalVector: [2 3 -1] Offset: -4 FaceColor: [0.4902 0.4902 0.4902] FaceAlpha: 0.3000 Use GET to show all properties
grid on
xlim([-10 10])
ylim([-10 10])
zlim([-60 60])

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