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Normalize features

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neingeist 2014-10-02 22:20:44 +02:00
parent 613220bb3e
commit 8559c243c5
1 changed files with 10 additions and 1 deletions
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ex1/featureNormalize.m
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@ -26,9 +26,18 @@ sigma = zeros(1, size(X, 2));
% Hint: You might find the 'mean' and 'std' functions useful. % Hint: You might find the 'mean' and 'std' functions useful.
% %
mu = mean(X);
sigma = std(X);
% This gives broadcasting warnings, but works, too:
%
% X_norm = (X - mu) ./ sigma;
%
% warning: operator -: automatic broadcasting operation applied
% warning: quotient: automatic broadcasting operation applied
X_norm = bsxfun(@rdivide, bsxfun(@minus, X, mu), sigma);
% ============================================================ % ============================================================