randPatPar: Random Patterns spatial permutation algorithm

In mcglinnlab/vario: Community variograms and associated null models

Random Patterns spatial permutation algorithm

Description

A convience function for working with randPat which calls the .C function 'randpatpar'. This function allows you to specify the number of processors to run on adding processsors only helps if working with many species as each species is evaulated on a different processor. Returns a (5+(n+2)^2) x S matrix, the first five rows of which are species index, phi strata stat, number of strata swaps, phi pixel swap, and number of pixel swaps, and then the remaining rows are the presences/abundances in the randomized occurances

Usage

randPatPar(
  psp,
  nstrata,
  mtrials1 = 1000,
  mtrials2 = 1e+06,
  alpha = 0.01,
  npar = 1
)

Arguments

psp	multidimenstional S x (n+2) x (n+2) array
alpha	the cutoff value for the phi statistic of Roxburgh and Chesson 1998
npar	the number of processors to run the code on
n	the size of the orginal 2-D array along one spatial axis (i.e., without extra rows and columns)
pl	the places in rpsp that can be swaped
mtrials	the numbef of times to attempt a swap

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