Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4109#discussion_r23566423
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -34,6 +34,9 @@ sealed trait Matrix extends Serializable {
/** Number of columns. */
def numCols: Int
+ /** Flag that keeps track whether the matrix is transposed or not. False
by default. */
+ private[linalg] var isTransposed = false
--- End diff --
We should make this public because otherwise users won't be able to
understand public members like `values`. This should be a `val` instead of
`var` because we don't modify it in-place.
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