distance_columns
extracts columns from the distance matrix.
distance_columns(distances, column_indices, row_indices = NULL)
A distances
object.
An integer vector with point indices indicating which columns to be extracted.
If NULL
, complete rows will be extracted.
If integer vector with point indices, only the indicated
rows will be extracted.
Returns a matrix with the requested columns.
If the complete distance matrix is desired, distance_matrix
is
faster than distance_columns
.