Changeset 8455 for trunk/sources/HeuristicLab.Algorithms.DataAnalysis/3.4/GaussianProcess/CovarianceSum.cs

Timestamp:

08/09/12 09:33:23 (12 years ago)

Author:

gkronber

Message:

#1902 changed calculation of gradients for covariance functions to reduce allocations of arrays

File:

• trunk/sources/HeuristicLab.Algorithms.DataAnalysis/3.4/GaussianProcess/CovarianceSum.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Algorithms.DataAnalysis/3.4/GaussianProcess/CovarianceSum.cs

@@ -86 +86 @@
     }
 
-    public double[] GetGradient(int i, int j) {
-      return terms.Select(t => t.GetGradient(i, j)).SelectMany(seq => seq).ToArray();
+    public double GetGradient(int i, int j, int k) {
+      int ii = 0;
+      while (k > terms[ii].GetNumberOfParameters(numberOfVariables)) {
+        k -= terms[ii].GetNumberOfParameters(numberOfVariables);
+      }
+      return terms[ii].GetGradient(i, j, k);
     }
   }