an object which contains a permutation vector (currently an
integer vector or an object of class hclust)
method
a string representing the method used to obtain the
permutation vector
Details
A permutation vector is a permutation of the integer vector
$<1, 2,="" ...,="" n="">$, were $n$ is the number of objects. For example,
the permutation vector $<3, 2="" 1,="">$ indicates that in first position is the
object with index 3 then the object with index 1 and finally the object
with index 2.
ser_permutation_vector objects are usually packed into
a ser_permutation object
which is a collection of $k$ permutation vectors for $k$-mode data.
The constructor ser_permutation_vector
checks if the permutation vector is valid
(i.e. if all integers occur exactly once).