Changeset 2923 in Sophya for trunk/SophyaLib/TArray/matharr.cc

Timestamp:

Mar 27, 2006, 6:58:11 PM (20 years ago)

Author:

ansari

Message:

Correction calcul sigma des tableaux (facteur N/N-1) - Reza 27/3/2006

File:

• trunk/SophyaLib/TArray/matharr.cc (modified) (1 diff)

trunk/SophyaLib/TArray/matharr.cc

@@ -148 +148 @@
   double dsz = (double)(a.Size());
   mean /= dsz;
-  sig = sig/dsz - mean*mean;
-  if (sig >= 0.) sig = sqrt(sig);
+  if (dsz > 1.5) {
+    sig = sig/dsz - mean*mean;
+    sig *= (dsz/(dsz-1));
+    if (sig >= 0.) sig = sqrt(sig);
+  }
+  else sig = 0.;
   return(mean);
 }