[ViewVC] Diff of: group/trunk/mdtools/md

Comparing trunk/mdtools/md_code/randomSPRNG.cpp (file contents):
Revision 219 by chuckv, Sun Dec 29 19:12:06 2002 UTC vs.
Revision 253 by chuckv, Thu Jan 30 15:20:21 2003 UTC

+#include "randomSPRNG.hpp"
+#include "simError.h"
-+
+#include "sprng.h"
-+
+#ifdef IS_MPI
-+
+#include "mpiSimulation.hpp"
-+
+#endif
-<
+randomSPRNG::randomSPRNG(){
->
+using namespace std;
-+
+/* randomStreamSPRNF creates a new SPRNG stream for random numbers
-+
+ */
-+
+int randomSPRNG::nStreamsInitialized = 0;
-+
+randomSPRNG::randomSPRNG(int iseed){
-+
+  int newSeed;
-+
+  nStreamsInitialized++;
-+
+  newSeed = abs(iseed) + nStreamsInitialized;
-+
+  if( newSeed < 0 ) newSeed = abs( newSeed );
-+
-+
+#ifdef IS_MPI
-+
-+
+  nSPRNGStreams = mpiSim->getNumberProcessors();
-+
-+
+  myStreamNumber = mpiSim->getMyNode();
-+
-+
-+
-+
+#else
-+
-+
+  nSPRNGStreams = 1;
-+
+  myStreamNumber = 0;
-+
-+
+#endif
-+
-+
-+
+  thisStream = init_sprng(GTYPE,myStreamNumber,nSPRNGStreams,
-+
+                         newSeed,SPRNG_DEFAULT);
-+
-+
+randomSPRNG::~randomSPRNG(){
-+
+  if ( thisStream != NULL){
-+
+    free_sprng(thisStream);
-+
+    nStreamsInitialized--;
-+
+  }
-+
+}
-+
-+
-+
+double randomSPRNG::getRandom(){
-+
+  return sprng(thisStream);
-+
+}
-+
-+
-+
+// Gaussian SPRNG class...
-+
-+
+double gaussianSPRNG::getGaussian(){
-+
+  double ranNum1;
-+
+  double ranNum2;
-+
+  double gaussianNumber;
-+
-+
+  ranNum1 = getRandom();
-+
+  ranNum2 = getRandom();
-+
-+
+  gaussianNumber = sqrt(-2.0 * log(ranNum1)) * cos(2 * M_PI * ranNum2);
-+
-+
+  return gaussianNumber;
-+
+}

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