Index positions to a Hilbert Curve
index(x, ..., n = 10L)# S3 method for data.frame
index(x, ..., n, coords = c(1, 2), attach = TRUE)
# S3 method for matrix
index(x, ..., n, coords = c(1, 2), attach = TRUE)
# S3 method for double
index(x, y, ..., n)
# S3 method for numeric
index(x, y, ..., n)
# S3 method for integer
index(x, y, ..., n)
index64(x, ..., n = 10L)
# S3 method for data.frame
index64(x, ..., n, coords = c(1, 2), attach = TRUE)
# S3 method for matrix
index64(x, ..., n, coords = c(1, 2), attach = TRUE)
# S3 method for double
index64(x, y, ..., n)
# S3 method for integer
index64(x, y, ..., n)
# S3 method for numeric
index64(x, y, ..., n)
# S3 method for integer64
index64(x, y, ..., n)
# S3 method for character
index64(x, y, ..., n)
# S3 method for bitstring
index64(x, y, ..., n)
One of: Numeric vector, data.frame, or matrix.
If a numeric vector, then it corresponds to the rows
of a position.
Unused.
Exponent to the dimensions of the underlying grid. The Hilbert
Curve indices are based on a 2^n x 2^n grid. This number
must be less than 15 due to the 32-bit implementation of R.
Column names or indices of a data.frame/matrix that
contain the position coordinates.
If TRUE, adds the indices as a new column to the given
data.frame/matrix. If x is a data.frame, then the
column is named h; otherwise, it is an unnamed column at
the end of the matrix.
Numeric vector. Corresponds to the columns of a position.
An integer vector of Hilbert indices, or when attach is TRUE,
the original object (data.frame or matrix) with a new integer
column (h for data.frame) containing the Hilbert indices. When
n is greater than 15, the vector is of type bit64::integer64.