Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4109#discussion_r23268088
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -114,21 +106,47 @@ class DenseMatrix(val numRows: Int, val numCols: Int,
val values: Array[Double])
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
+ override def toArray: Array[Double] = {
+ if (!isTransposed) {
+ values
+ } else {
+ val transposedValues = new Array[Double](values.length)
+ var j = 0
+ while (j < numCols) {
+ var i = 0
+ val indStart = j * numRows
+ while (i < numRows) {
+ transposedValues(indStart + i) = values(j + i * numCols)
+ i += 1
+ }
+ j += 1
+ }
+ transposedValues
+ }
+ }
override def equals(o: Any) = o match {
case m: DenseMatrix =>
- m.numRows == numRows && m.numCols == numCols &&
Arrays.equals(toArray, m.toArray)
+ m.numRows == numRows && m.numCols == numCols &&
jArrays.equals(toArray, m.toArray)
case _ => false
}
- private[mllib] def toBreeze: BM[Double] = new BDM[Double](numRows,
numCols, values)
+ private[mllib] def toBreeze: BM[Double] = {
--- End diff --
Do we handle the transpose flag in `fromBreeze`?
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