[GitHub] incubator-spark pull request: Principal Component Analysis

[rezazadeh]

Github user rezazadeh commented on the pull request:

    https://github.com/apache/incubator-spark/pull/564#discussion_r9767064
  
    It is the standard way to compute the coefficient matrix matrix, even 
though the principal components aren't affected by it, it's good style in case 
we want to output the variances later on.