dissimilarity.object  R Documentation 
Objects of class "dissimilarity"
representing the dissimilarity
matrix of a dataset.
The dissimilarity matrix is symmetric, and hence its lower triangle
(column wise) is represented as a vector to save storage space.
If the object, is called do
, and n
the number of
observations, i.e., n < attr(do, "Size")
, then
for i < j <= n
, the dissimilarity between (row) i and j is
do[n*(i1)  i*(i1)/2 + ji]
.
The length of the vector is n*(n1)/2
, i.e., of order n^2
.
"dissimilarity"
objects also inherit from class
dist
and can use dist
methods, in
particular, as.matrix
, such that d_{ij}
from above is just as.matrix(do)[i,j]
.
The object has the following attributes:
Size 
the number of observations in the dataset. 
Metric 
the metric used for calculating the dissimilarities. Possible values are "euclidean", "manhattan", "mixed" (if variables of different types were present in the dataset), and "unspecified". 
Labels 
optionally, contains the labels, if any, of the observations of the dataset. 
NA.message 
optionally, if a dissimilarity could not be computed, because of too many missing values for some observations of the dataset. 
Types 
when a mixed metric was used, the types for each
variable as oneletter codes, see also

daisy
returns this class of objects.
Also the functions pam
, clara
, fanny
,
agnes
, and diana
return a dissimilarity
object,
as one component of their return objects.
The "dissimilarity"
class has methods for the following generic
functions: print
, summary
.
daisy
, dist
,
pam
, clara
, fanny
,
agnes
, diana
.
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