This function calculate the heterogeneity of a partition as the sum of the heterogeneity of all classes
obtained withheterog.Ck
.
1  heterog.parti(dist.var, dist.geo, partition, wt, alpha)

dist.var 
a square symetric matrix with the distances between individuals measured on the variables. 
dist.geo 
a square symetric matrix with the geographical distances between individuals. 
partition 
a vector of size 
wt 
a vector of size 
alpha 
a real between 0 and 1 to fit the global criterion to optimize 
Note that in the calcul of Inertia, the two matrices of distances are normalized (divided by their own maximum).
res a list containing the following results : the Inertia of the partition based on dist.var
,
the Inertia of the partition based on dist.geo
, the heterogeneity of the partition as defined in description.
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