Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4109#discussion_r23589813
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -92,6 +87,15 @@ sealed trait Matrix extends Serializable {
* backing array. For example, an operation such as addition or
subtraction will only be
* performed on the non-zero values in a `SparseMatrix`. */
private[mllib] def update(f: Double => Double): Matrix
+
+ /**
+ * Applies a function `f` to all the active elements of dense and sparse
matrix.
--- End diff --
It may be worth noting that the ordering of elements are not defined.
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