Changeset 1192 for trunk/source/processes/electromagnetic/lowenergy/src/G4LinLogInterpolation.cc

Timestamp:

Nov 19, 2009, 2:53:25 PM (15 years ago)

Author:

garnier

Message:

update par rapport a CVS

File:

• trunk/source/processes/electromagnetic/lowenergy/src/G4LinLogInterpolation.cc (modified) (2 diffs)

trunk/source/processes/electromagnetic/lowenergy/src/G4LinLogInterpolation.cc

@@ -52 +52 @@
                                           const G4DataVector& data) const
 {
+  //G4cout << "G4LinLogInterpolation is performed on dataset (2 arguments) " << G4endl;
   G4int nBins = data.size() - 1;
   G4double value = 0.;
@@ -72 +73 @@
   return value;
 }
+
+G4double G4LinLogInterpolation::Calculate(G4double x, G4int bin, 
+                                          const G4DataVector& points,
+                                          const G4DataVector& data,
+                                          const G4DataVector& /*log_points*/, 
+                                          const G4DataVector& log_data) const
+{
+  //G4cout << "G4LinLogInterpolation is performed on dataset (4 arguments) " << G4endl;
+  G4int nBins = data.size() - 1;
+  G4double value = 0.;
+  //G4double log_x = std::log10(x);
+  if (x < points[0])
+    {
+      value = 0.;
+    }
+  else if (bin < nBins)
+    {
+      G4double e1 = points[bin];
+      G4double e2 = points[bin+1];
+      G4double d1 = data[bin];
+      G4double d2 = data[bin+1];
+      //G4double log_e1 = log_points[bin];
+      //G4double log_e2 = log_points[bin+1];
+      G4double log_d1 = log_data[bin];
+      G4double log_d2 = log_data[bin+1];
+      if (d1 > 0.0 && d2 > 0.0)
+        {
+// Values e1, e2, d1 and d2 are the log values of the corresponding
+// original energy and data values. Simple linear interpolation performed
+// on loagarithmic data should be equivalent to log-log interpolation
+          //value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
+          value = std::exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
+        }
+      else
+        {
+          if (d1 == 0.0) log_d1 = -300;
+          if (d2 == 0.0) log_d2 = -300;
+          value = std::exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
+        }
+   }
+ else
+   {
+     value = data[nBins];
+   }
+  return value;
+}
+