spatstat (version 1.0-1)

catHughes: Hughes' Cat Retina Data

Description

Austin Hughes' data: a point pattern of ganglion cells in the retina of a cat. A marked point pattern.

Usage

data(catHughes)

Arguments

format

An object of class "ppp" representing the point pattern of cell locations. Entries include ll{ x Cartesian $x$-coordinate of cell y Cartesian $y$-coordinate of cell marks factor with levels 0 and 1 indicating ``off'' and ``on'' cells respectively. } See ppp.object for details of the format.

source

Peter Diggle, personal communication

Notes

Austin Hughes' data: a point pattern of ganglion cells in the retina of a cat. 152 ``on'' cells and 142 ``off'' cells in a rectangle with dimensions 1.6065 by 1.0 where the unit of measurement is approximately 1 mm.