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- function [X_poly] = polyFeatures(X, p)
- %POLYFEATURES Maps X (1D vector) into the p-th power
- % [X_poly] = POLYFEATURES(X, p) takes a data matrix X (size m x 1) and
- % maps each example into its polynomial features where
- % X_poly(i, :) = [X(i) X(i).^2 X(i).^3 ... X(i).^p];
- %
- % You need to return the following variables correctly.
- X_poly = zeros(numel(X), p);
- % ====================== YOUR CODE HERE ======================
- % Instructions: Given a vector X, return a matrix X_poly where the p-th
- % column of X contains the values of X to the p-th power.
- %
- %
- z = X;
- for i = 1:p
- X_poly(:, i) = z;
- z = z .* X;
- end
- % =========================================================================
- end
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