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diff --git a/sourcecodes/bnt-master/KPMtools/sumv.m b/sourcecodes/bnt-master/KPMtools/sumv.m
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+function T2 = sumv(T1, sum_over)
+%
+% Like the built in sum, but will sum over several dimensions and then squeeze the result.
+
+T2 = T1;
+for i=1:length(sum_over)
+  if sum_over(i) <= ndims(T2) % prevent summing over non-existent dimensions
+    T2=sum(T2, sum_over(i));
+  end
+end
+T2 = squeeze(T2);