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Moving course1 to course1 subdir.

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Vahagn Khachatryan
2017-02-12 08:17:57 +00:00
parent f26649af32
commit 0f459c597c
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17
machine_learning/course1/mlclass-ex8-008/mlclass-ex8/normalizeRatings.m Executable file
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function [Ynorm, Ymean] = normalizeRatings(Y, R)
%NORMALIZERATINGS Preprocess data by subtracting mean rating for every
%movie (every row)
% [Ynorm, Ymean] = NORMALIZERATINGS(Y, R) normalized Y so that each movie
% has a rating of 0 on average, and returns the mean rating in Ymean.
%
[m, n] = size(Y);
Ymean = zeros(m, 1);
Ynorm = zeros(size(Y));
for i = 1:m
idx = find(R(i, :) == 1);
Ymean(i) = mean(Y(i, idx));
Ynorm(i, idx) = Y(i, idx) - Ymean(i);
end
end