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Update computeCentroids.m #3

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24 changes: 14 additions & 10 deletions Andrew Ng Stanford Coursera/Week 08/ex7/computeCentroids.m
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
function centroids = computeCentroids(X, idx, K)
%COMPUTECENTROIDS returs the new centroids by computing the means of the
%COMPUTECENTROIDS returns the new centroids by computing the means of the
%data points assigned to each centroid.
% centroids = COMPUTECENTROIDS(X, idx, K) returns the new centroids by
% computing the means of the data points assigned to each centroid. It is
Expand All @@ -26,16 +26,20 @@
% Note: You can use a for-loop over the centroids to compute this.
%

counts = zeros(K,1);
for i = 1:m,
for j = 1:K,
if idx(i) == j,
centroids(j,:) = (centroids(j,:) + X(i,:));
counts(j) = counts(j) + 1;
counts=zeros(K,1)
for i = 1:m
for j =1:K
if idx(i)==j
centroids(j,:)=centroids(j,:)+X(i,:)
counts(j)=counts(j)+1
end
end
end
end
centroids = centroids./counts;
end
for k=1:n
centroids(:,k)=centroids(:,k)./counts
end


% =============================================================


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