Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2294#discussion_r17709072
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -36,9 +37,42 @@ trait Matrix extends Serializable {
/** Converts to a breeze matrix. */
private[mllib] def toBreeze: BM[Double]
+ /** Gets the i-th element in the array backing the matrix. */
+ private[mllib] def apply(i: Int): Double
--- End diff --
Maybe it is good to remove this method. Because it may cause confusion
between DenseMatrix and SparseMatrix.
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