seriation (version 1.2-0)

get_order: Extracting Order Information from a Permutation Object

Description

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.

Usage

get_order(x, ...)
## S3 method for class 'ser_permutation_vector':
get_order(x, \ldots)
## S3 method for class 'ser_permutation':
get_order(x, dim = 1, \ldots)
get_rank(x, ...)
get_permutation_matrix(x, ...)

Arguments

x

an object of class ser_permutation or ser_permutation_vector.

dim

order information for which dimension should be returned?

...

further arguments are ignorred for get_order. For get_rank and for get_permutation_matrix the additional arguments are passed on to get_order (e.g., as dim).

Value

• Returns an integer permutation vector/a permutation matrix.

Details

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.

get_permutation_matrix returns a $n \times n$ permutation matrix.

See Also

ser_permutation_vector, ser_permutation

Examples

## 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)