How to get the values of centroids for each cluster in k means?

in the following code:

[idx, C]= kmeans(X,3);

is C the centroid of each cluster?thank you

Answer 1

[Image Analyst]

I don't know that the centroid is necessarily at a data point. Did kmeans guarantee that it is? If not, you might have to interpolate from the nearest neighbors, if that is even appropriate.