Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2294#discussion_r17709076
--- 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
+
/** Gets the (i, j)-th element. */
- private[mllib] def apply(i: Int, j: Int): Double = toBreeze(i, j)
+ private[mllib] def apply(i: Int, j: Int): Double
+
+ /** Return the index for the (i, j)-th element in the backing array. */
+ private[mllib] def index(i: Int, j: Int): Int
+
+ /** Update element at (i, j) */
+ private[mllib] def update(i: Int, j: Int, v: Double)
+
+ /** Get a deep copy of the matrix. */
+ def copy: Matrix
+
+ /** Convenience method for `Matrix`-`DenseMatrix` multiplication. */
+ def times(y: DenseMatrix): DenseMatrix = {
--- End diff --
We use `multiply` in distributed matrix and we should be consistent.
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