subset.popn: Subset popn Object

Description

Retain selected rows of a popn object.

Usage

# S3 method for popn
subset(x, subset = NULL, sessions = NULL, poly = NULL,
    poly.habitat = TRUE, keep.poly = TRUE, renumber = FALSE, …)

Arguments

popn object

subset

vector to subscript the rows of x

sessions

vector to subscript sessions if x is a multi-session population

poly

bounding polygon (see Details)

poly.habitat

logical for whether poly represents habitat or its inverse (non-habitat)

keep.poly

logical; if TRUE any bounding polygon is saved as the attribute `polygon'

renumber

logical for whether to renumber rows in output

…

arguments passed to other functions

Value

An object of class popn with only the requested subset of rows. Subsetting is applied to the covariates attribute if this is present. Attributes `Ndist' and `model2D' are set to NULL.

If poly is specified, points outside poly are dropped. poly may be either

a matrix or dataframe of two columns interpreted as x and y coordinates, or
a SpatialPolygonsDataFrame object as defined in the package `sp', possibly from reading a shapefile with readOGR() from package `rgdal'.

Details

The subscripts in subset may be of type integer, character or logical as described in Extract. By default, all rows are retained.

In the case of a multi-session popn object (a list of populations), subset may be a list with one component for the subscripts in each new session.

Examples

Run this code


temppop <- sim.popn (D = 10, expand.grid(x = c(0,100), y =
    c(0,100)), buffer = 50)
## 50% binomial sample of simulated population
temppops <- subset(temppop, runif(nrow(temppop)) < 0.5)
plot(temppop)
plot(temppops, add = TRUE, pch = 16)