Fix standard deviation calculation in average correlation code

00238cfe · Tiago Peixoto · 07f568f7 · 00238cfe
Commit 00238cfe authored May 20, 2010 by Tiago Peixoto
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src/graph/correlations/graph_correlations.hh src/graph/correlations/graph_correlations.hh +3 -2

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--- a/src/graph/correlations/graph_correlations.hh
+++ b/src/graph/correlations/graph_correlations.hh
@@ -330,8 +330,9 @@ struct get_avg_correlation
        {
            sum.GetArray()[i] /= count.GetArray()[i];
            sum2.GetArray()[i] =
-                sqrt(sum2.GetArray()[i]/count.GetArray()[i] -
-                     sum.GetArray()[i])/sqrt(count.GetArray()[i]);
+                sqrt(abs(sum2.GetArray()[i]/count.GetArray()[i] -
+                         sum.GetArray()[i] * sum.GetArray()[i])) /
+                sqrt(count.GetArray()[i]);
        }

        bins = sum.GetBins();