fixed some random number stuff

1 files changed, 7 insertions, 6 deletions

diff --git a/vowpalwabbit/rand48.cc b/vowpalwabbit/rand48.cc
index d7aa5ff5..5da05cea 100644
--- a/vowpalwabbit/rand48.cc
+++ b/vowpalwabbit/rand48.cc
@@ -3,7 +3,7 @@
 #include <iostream>
 using namespace std;
 
-uint64_t a = 0x5DEECE66D;
+uint64_t a = 0xEECE66D5DEECE66D;
 uint64_t c = 2147483647;
 
 int bias = 127 << 23;
@@ -11,7 +11,7 @@ int bias = 127 << 23;
 float merand48(uint64_t& initial)
 {
   initial = a * initial + c;
-  int32_t temp = (initial >> 41) | bias;
+  int32_t temp = ((initial >> 25) & 0x7FFFFF) | bias;
   return *(float *)&temp - 1;
 }
 
@@ -27,14 +27,15 @@ float frand48()
 	return merand48(v);
 }
 
-
 /*
-
-int mantissa = 128 << 15;
+//int mantissa = 128 << 15;
 
 int main(int argc, char *argv[])
 {
-  for (size_t i = 0 ; i < 100000; i++)
+  for (size_t i = 0 ; i < 100000; i++) {
+    msrand48(i);
     cout << frand48() << endl;
+  }
 }
+
 */