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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