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Calculates pairwise population based Linkage Disequilibrium across all loci using the specified number of cores

Source: R/gl.report.ld.r
gl.report.ld.Rd

This function is implemented in a parallel fashion to speed up the process. There is also the ability to restart the function if crashed by specifying the chunk file names or restarting the function exactly in the same way as in the first run. This is implemented because sometimes, due to connectivity loss between cores, the function may crash half way. Before running the function, it is advisable to use the function gl.filter.allna to remove loci with all missing data.

Usage

gl.report.ld(
  x,
  name = NULL,
  save = TRUE,
  outpath = tempdir(),
  nchunks = 2,
  ncores = 1,
  chunkname = NULL,
  probar = FALSE,
  verbose = NULL
)

Arguments

x

A genlight or genind object created (genlight objects are internally converted via gl2gi to genind) [required].

name

Character string for rdata file. If not given genind object name is used [default NULL].

save

Switch if results are saved in a file [default TRUE].

outpath

Folder where chunks and results are saved (if save=TRUE) [default tempdir()].

nchunks

How many subchunks will be used (the less the faster, but if the routine crashes more bits are lost) [default 2].

ncores

How many cores should be used [default 1].

chunkname

The name of the chunks for saving [default NULL].

probar

if TRUE, a progress bar is displayed for long loops [default = TRUE].

verbose

Verbosity: 0, silent or fatal errors; 1, begin and end; 2, progress log; 3, progress and results summary; 5, full report [default 2 or as specified using gl.set.verbosity].

Value

Returns calculation of pairwise LD across all loci between subpopulations. This functions uses if specified many cores on your computer to speed up. And if save is used can restart (if save=TRUE is used) with the same command starting where it crashed. The final output is a data frame that holds all statistics of pairwise LD between loci. (See ?LD in package genetics for details).

Author

Bernd Gruber (Post to https://groups.google.com/d/forum/dartr)