Computes the matrix of distances between all pairs of points
in a set of points
Usage
## S3 method for class 'default':
pairdist(X, Y=NULL, \dots, method="C")
Arguments
X,Y
Arguments specifying the coordinates of a set of points.
Typically X and Y would be
numeric vectors of equal length.
Alternatively Y may be omitted and X may be
a list with two components
...
Ignored.
method
String specifying which method of calculation to use.
Values are "C" and "interpreted".
Usually not specified.
Value
A square matrix whose [i,j] entry is the distance
between the points numbered i and j.
Details
Given the coordinates of a set of points,
this function computes the Euclidean distances between all pairs of
points, and returns the matrix of distances.
It is a method for the generic function pairdist.
The arguments X and Y must determine
the coordinates of a set of points. Typically X and
Y would be numeric vectors of equal length. Alternatively
Y may be omitted and X may be a list with two components
named x and y, or a matrix or data frame with two columns.
The argument method is not normally used. It is
retained only for checking the validity of the software.
If method = "interpreted" then the distances are
computed using interpreted R code only. If method="C"
(the default) then C code is used. The C code is somewhat faster.