plotting a plane in three dimensions including data points

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?

Answer 1

[Erivelton Gualter]

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

Answer 2

[cui,xingxing]

https://www.mathworks.com/matlabcentral/answers/101174-how-can-i-generate-a-plane-surface-in-matlab

repeated question.

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Answer 3

[Adam Danz]

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])