Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2294#discussion_r17709092
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -93,9 +247,84 @@ object Matrices {
require(dm.majorStride == dm.rows,
"Do not support stride size different from the number of rows.")
new DenseMatrix(dm.rows, dm.cols, dm.data)
+ case sm: BSM[Double] =>
+ new SparseMatrix(sm.rows, sm.cols, sm.colPtrs, sm.rowIndices,
sm.data)
case _ =>
throw new UnsupportedOperationException(
s"Do not support conversion from type
${breeze.getClass.getName}.")
}
}
+
+ /**
+ * Generate a `DenseMatrix` consisting of zeros.
+ * @param numRows number of rows of the matrix
+ * @param numCols number of columns of the matrix
+ * @return `DenseMatrix` with size `numRows` x `numCols` and values of
zeros
+ */
+ def zeros(numRows: Int, numCols: Int): Matrix =
+ new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)(0.0))
--- End diff --
`new Array` instead of `Array.fill`
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