Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2451#discussion_r17802108
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -57,13 +250,709 @@ trait Matrix extends Serializable {
* @param numCols number of columns
* @param values matrix entries in column major
*/
-class DenseMatrix(val numRows: Int, val numCols: Int, val values:
Array[Double]) extends Matrix {
+class DenseMatrix(val numRows: Int, val numCols: Int, val values:
Array[Double]) extends Matrix with Serializable {
- require(values.length == numRows * numCols)
+ require(values.length == numRows * numCols, "The number of values
supplied doesn't match the " +
+ s"size of the matrix! values.length: ${values.length}, numRows *
numCols: ${numRows * numCols}")
override def toArray: Array[Double] = values
- private[mllib] override def toBreeze: BM[Double] = new
BDM[Double](numRows, numCols, values)
+ private[mllib] def toBreeze: BM[Double] = new BDM[Double](numRows,
numCols, values)
+
+ private[mllib] def apply(i: Int): Double = values(i)
+
+ private[mllib] def apply(i: Int, j: Int): Double = values(index(i, j))
+
+ private[mllib] def index(i: Int, j: Int): Int = i + numRows * j
+
+ private[mllib] def update(i: Int, j: Int, v: Double): Unit = {
+ values(index(i, j)) = v
+ }
+
+ override def copy = new DenseMatrix(numRows, numCols, values.clone())
+
+ private[mllib] def elementWiseOperateOnColumnsInPlace(
+ f: (Double, Double) => Double,
+ y: Matrix): DenseMatrix = {
+ val y_vals = y.toArray
+ val len = y_vals.length
+ require(y_vals.length == numRows)
--- End diff --
Please add warning messages (here and in other require statements).
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