Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/9916#discussion_r49251954
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala
---
@@ -351,6 +355,28 @@ class BlockMatrix @Since("1.3.0") (
}
}
+ /**
+ * Adds two block matrices together. The matrices must have the same
size and matching
+ * `rowsPerBlock` and `colsPerBlock` values. If one of the blocks that
are being added are
+ * instances of [[SparseMatrix]], the resulting sub matrix will also be
a [[SparseMatrix]], even
+ * if it is being added to a [[DenseMatrix]]. If two dense matrices are
added, the output will
+ * also be a [[DenseMatrix]].
+ */
+ @Since("1.3.0")
+ def add(other: BlockMatrix): BlockMatrix =
+ blockMap(other, (x: BM[Double], y: BM[Double]) => x + y)
+
+ /**
+ * Subtracts two block matrices together. The matrices must have the
same size and matching
--- End diff --
```Subtracts two block matrices together.``` --> ```Subtracts the given
block matrix `other` from this block matrix: `this - other`.```
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