25 lines
734 B
Mathematica
25 lines
734 B
Mathematica
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function visualizeBoundary(X, y, model, varargin)
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%VISUALIZEBOUNDARY plots a non-linear decision boundary learned by the SVM
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% VISUALIZEBOUNDARYLINEAR(X, y, model) plots a non-linear decision
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% boundary learned by the SVM and overlays the data on it
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% Plot the training data on top of the boundary
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plotData(X, y)
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% Make classification predictions over a grid of values
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x1plot = linspace(min(X(:,1)), max(X(:,1)), 100)';
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x2plot = linspace(min(X(:,2)), max(X(:,2)), 100)';
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[X1, X2] = meshgrid(x1plot, x2plot);
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vals = zeros(size(X1));
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for i = 1:size(X1, 2)
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this_X = [X1(:, i), X2(:, i)];
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vals(:, i) = svmPredict(model, this_X);
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end
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% Plot the SVM boundary
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hold on
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contour(X1, X2, vals, [0 0], 'Color', 'b');
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hold off;
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end
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