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How to draw an SVM regression plot

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영훈 정
영훈 정 on 13 Sep 2023
Answered: Drew on 13 Sep 2023
As shown in the figure, I would like to draw a plot that includes the lines of the margin, support vector, and seperating hyperplane of the model.
However, even if I get a model using fitrsvm, I can't use the information in the support vector.
I need your help.
x = normrnd(10,1,1000,1);
y = x*3 + normrnd(10,1,1000,1);
hold on
Mdl = fitrsvm(x,y)
Mdl =
RegressionSVM ResponseName: 'Y' CategoricalPredictors: [] ResponseTransform: 'none' Alpha: [768×1 double] Bias: 10.6836 KernelParameters: [1×1 struct] NumObservations: 1000 BoxConstraints: [1000×1 double] ConvergenceInfo: [1×1 struct] IsSupportVector: [1000×1 logical] Solver: 'SMO' Properties, Methods
figure(1);scatter(x, y);
It's an example of a hand-drawn drawing. I want to draw something like this.

Accepted Answer

Drew
Drew on 13 Sep 2023
The doc page
has several examples where the fitcsvm support vectors are circled in a gscatter plot, and the decision boundary is drawn using contour.

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