From a7a1261f52112a3bca375dd0bed1c1bc0a2e0ed8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E6=B3=A2?= <601450868@qq.com>
Date: Sat, 30 Jul 2016 23:43:36 +0800
Subject: [PATCH 1/2] Add rand(numRows: Int, numCols: Int) functions

add rand(numRows: Int, numCols: Int) functions to DenseMatrix object,like breeze.linalg.DenseMatrix.rand()
---
 .../org/apache/spark/mllib/linalg/Matrices.scala   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
index e8f34388cd9fe..05f0ccaf94f8d 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
@@ -496,6 +496,20 @@ object DenseMatrix {
     new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)(rng.nextDouble()))
   }
 
+  /**
+    * Generate a `DenseMatrix` consisting of `i.i.d.` uniform random numbers.
+    * 
+    * @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 in U(0, 1)
+    */
+  @Since("2.0.0")
+  def rand(numRows: Int, numCols: Int): DenseMatrix = {
+    require(numRows.toLong * numCols <= Int.MaxValue,
+      s"$numRows x $numCols dense matrix is too large to allocate")
+    new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)((new Random).nextDouble()))
+  }
+  
   /**
    * Generate a `DenseMatrix` consisting of `i.i.d.` gaussian random numbers.
    * @param numRows number of rows of the matrix

From 054b70ccce73c02cce04caf9f7958cfc555df829 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E6=B3=A2?= <601450868@qq.com>
Date: Sun, 31 Jul 2016 00:36:30 +0800
Subject: [PATCH 2/2] fix RNG

fix RNG , his makes a new RNG for All element
---
 .../main/scala/org/apache/spark/mllib/linalg/Matrices.scala    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
index 05f0ccaf94f8d..0f2ac8a68f9f6 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
@@ -507,7 +507,8 @@ object DenseMatrix {
   def rand(numRows: Int, numCols: Int): DenseMatrix = {
     require(numRows.toLong * numCols <= Int.MaxValue,
       s"$numRows x $numCols dense matrix is too large to allocate")
-    new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)((new Random).nextDouble()))
+    val rng=new Random()
+    new DenseMatrix(numRows, numCols, Array.fill(numRows * numCols)(rng.nextDouble()))
   }
   
   /**