Extracting Order Information from a Permutation Object
Method to get the order information from an object of class
ser_permutation or ser_permutation_vector.
Order information can be extracted as an integer permutation vector,
a vector containing the object ranks or a permutation matrix.
get_order(x, ...) ## S3 method for class 'ser_permutation_vector' get_order(x, ...) ## S3 method for class 'ser_permutation' get_order(x, dim = 1, ...) get_rank(x, ...) get_permutation_matrix(x, ...)
x |
an object of class |
dim |
order information for which dimension should be returned? |
... |
further arguments are ignorred for |
get_order returns the seriation as an integer vector containing
the order of the objects after permutation. That is, the index of the first,
second, ..., n-th object. These permuation vectors can directly be
used to reorder objects using subsetting with "[".
Note: In seriation we usually use these
order-based permutation vectors.
get_rank returns the seriation as an integer vector containing
the rank/position for each objects in the permutation. That is,
position of the first, second, ..., n-th object after permutation.
Note: Use order() to convert ranks back to an order.
get_permutation_matrix returns a n x n permutation matrix.
Returns an integer permutation vector/a permutation matrix.
Michael Hahsler
## permutation_vector o <- ser_permutation_vector(sample(10)) o get_order(o) get_rank(o) get_permutation_matrix(o) ## permutation o2 <- ser_permutation(o, sample(5)) o2 get_order(o2, dim = 2) get_rank(o2, dim = 2) get_permutation_matrix(o2, dim = 2)
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