Removes outliers in matrix containing SNP signals by identifying outlier elements. The values of the
elements that are outliers are substituted by corresponding values
predicted values Yest=W*H from the current affinity (W)
and copy number (H) estimates.
removeOutliers(Y, W, H, tau=10, ...)Returns an IxK matrix where outliers have been "pruned".
Outliers are substituted by the corresponding value of Yest.