# pairdist

0th

Percentile

##### Pairwise distances

Computes the matrix of distances between all pairs of points in a point pattern.

Keywords
spatial
##### Usage
pairdist(X, ..., method="C")
pairdist.ppp(X, ..., method="C")
pairdist.default(X, Y=NULL, ..., method="C")
##### Arguments
X,Y
Arguments specifying the locations of a set of points. For pairdist.ppp, the argument X should be a point pattern (object of class "ppp"). For pairdist.default, typically X and <
...
Ignored by pairdist.ppp and pairdist.default.
method
String specifying which method of calculation to use. Values are "C" and "interpreted". Usually not specified.
##### Details

This function computes the Euclidean distances between all pairs of points, and returns the matrix of distances.

The function pairdist is generic, with a method for point patterns (objects of class "ppp") and a default method.

The method for point patterns expects a single point pattern argument X and returns the matrix of its pairwise distances.

The default method expects that X and Y will 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.

##### Value

• A square matrix whose [i,j] entry is the distance between the points numbered i and j.

crossdist, nndist, Kest

##### Aliases
• pairdist
• pairdist.ppp
• pairdist.default
##### Examples
data(cells)
d <- pairdist(cells)

x <- runif(100)
y <- runif(100)
d <- pairdist(x, y)
Documentation reproduced from package spatstat, version 1.6-5, License: GPL version 2 or newer

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