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silhouette index corrected (avoid division by zero) #1

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11 changes: 8 additions & 3 deletions src/indices.f95
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Original file line number Diff line number Diff line change
Expand Up @@ -656,7 +656,7 @@ SUBROUTINE cluc_crit_silhouette(p,v)
double precision, intent(out) :: v
double precision, dimension(sNk) :: dk, sk
double precision :: a, b, s
integer :: i, k, pn
integer :: i, k, pn, numberOfElements

sk = 0
call cluc_group_counts(p)
Expand All @@ -665,8 +665,13 @@ SUBROUTINE cluc_crit_silhouette(p,v)
pn = p(i)

! Calc the average intra-cluster distance
a = sPtClDist(i,pn)/(sKNum(pn)-1)

numberOfElements=sKNum(pn)
IF (numberOfElements == 1) THEN
a = 0
ELSE
a = sPtClDist(i,pn)/(numberOfElements-1)
END IF

! Calc the minimum average distance to other clusters
DO k=1,sNk
IF (k == pn) THEN
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