Visualize the data in 3d

45 次查看(过去 30 天)
Jason Lyu
Jason Lyu 2022-12-8
X is a 138x3 matrix and Y is a vector has 138 entries
x1 denotes the first column of X and x2 denotes the second colum of X.
I want to plot a 3d scatter plot to visualize these two data sets vs Y, along with a line of the model as the image shown.
i already calculated the theta.
how to present the model in 3d plot by using fine grid points? The model has two variables so i am stucked here.

回答(1 个)

Ashutosh Bajpai
Ashutosh Bajpai 2023-2-17
To plot the model in a 3D scatter plot along with the data points, you can use the scatter3 function in MATLAB to plot the data points, and then use the meshgrid and mesh functions to create a 3D surface plot of the model. Here's how you can do this:
  1. Create a grid of X1 and X2 values using the 'meshgrid' function
  2. Calculate the model's predictions on the grid of X1 and X2 values
  3. Plot the data points using the scatter3 function
  4. Plot the model's predictions using the mesh function
The resulting plot should show the data points as a scatter plot, and the model as a surface plot. You can adjust the appearance of the plot using the various options and arguments available in the scatter3 and mesh functions.
Code for Reference:
x1 = X(:,1);
x2 = X(:,2);
min_x1 = min(x1);
max_x1 = max(x1);
min_x2 = min(x2);
max_x2 = max(x2);
[X1, X2] = meshgrid(linspace(min_x1, max_x1, 100), linspace(min_x2, max_x2, 100));
Z = theta(1) + theta(2)*X1 + theta(3)*X2;
scatter3(x1, x2, Y, '.');
hold on;
mesh(X1, X2, Z);
xlabel('X1');
ylabel('X2');
zlabel('Y');

类别

Help CenterFile Exchange 中查找有关 Surface and Mesh Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by