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- function out = mapFeature(X1, X2)
- % MAPFEATURE Feature mapping function to polynomial features
- %
- % MAPFEATURE(X1, X2) maps the two input features
- % to quadratic features used in the regularization exercise.
- %
- % Returns a new feature array with more features, comprising of
- % X1, X2, X1.^2, X2.^2, X1*X2, X1*X2.^2, etc..
- %
- % Inputs X1, X2 must be the same size
- %
- degree = 6;
- out = ones(size(X1(:,1)));
- for i = 1:degree
- for j = 0:i
- out(:, end+1) = (X1.^(i-j)).*(X2.^j);
- end
- end
- end
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