spatPermStrata: Permute an array of occurances under a given set of...

In mcglinnlab/vario: Community variograms and associated null models

Permute an array of occurances under a given set of constraints in 2-dimensions of space with defined spatial strata, see 'nstrata'

Description

Permute an array of occurances under a given set of constraints in 2-dimensions of space with defined spatial strata, see 'nstrata'

Usage

spatPermStrata(
  psp,
  shiftpos = NULL,
  rotate = NULL,
  meth = "shift",
  sp = FALSE,
  nstrata = 1
)

Arguments

psp	the sp x row x col array, where rows and columns specify where on the spatial grid the sample was located
shiftpos:	two numbers that are the x and y places to shift the grid, this is generated randomly if needed
rotate:	a single number 1-4 that indicates how many counterclockwise rotations to perform, generated randomly
meth:	the type of permutation to use, options include: 1) reflect: random reflection/rotations of species (only makes sence when sp are not fixed 2) shift: random torodial shifting with or with sp fixed 3) both: both reflection and shifting 4) random: random shuffle
sp:	if FALSE then obs composition of quadrats is fixed to the observed pattern if TRUE then species are each shuffled independently
nstrata:	is the number of strata along a single spatial axis within which to randomize

mcglinnlab/vario documentation built on Feb. 22, 2023, 1:49 p.m.