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