read.structure: Reading data from STRUCTURE

In adegenet: Exploratory Analysis of Genetic and Genomic Data

Reading data from STRUCTURE

Description

The function read.structure reads STRUCTURE data files (.str ou .stru) and convert them into a genind object. By default, this function is interactive and asks a few questions about data content. This can be disabled (for optional questions) by turning the 'ask' argument to FALSE. However, one has to know the number of genotypes, of markers and if genotypes are coded on a single or on two rows before importing data.

Usage

read.structure(
  file,
  n.ind = NULL,
  n.loc = NULL,
  onerowperind = NULL,
  col.lab = NULL,
  col.pop = NULL,
  col.others = NULL,
  row.marknames = NULL,
  NA.char = "-9",
  pop = NULL,
  sep = NULL,
  ask = TRUE,
  quiet = FALSE
)

Arguments

file	a character string giving the path to the file to convert, with the appropriate extension.
n.ind	an integer giving the number of genotypes (or 'individuals') in the dataset
n.loc	an integer giving the number of markers in the dataset
onerowperind	a STRUCTURE coding option: are genotypes coded on a single row (TRUE), or on two rows (FALSE, default)
col.lab	an integer giving the index of the column containing labels of genotypes. '0' if absent.
col.pop	an integer giving the index of the column containing population to which genotypes belong. '0' if absent.
col.others	an vector of integers giving the indexes of the columns containing other informations to be read. Will be available in @other of the created object.
row.marknames	an integer giving the index of the row containing the names of the markers. '0' if absent.
NA.char	the character string coding missing data. "-9" by default. Note that in any case, series of zero (like "000") are interpreted as NA too.
pop	an optional factor giving the population of each individual.
sep	a character string used as separator between alleles.
ask	a logical specifying if the function should ask for optional informations about the dataset (TRUE, default), or try to be as quiet as possible (FALSE).
quiet	logical stating whether a conversion message must be printed (TRUE,default) or not (FALSE).

Details

Note: read.structure is meant for DIPLOID DATA ONLY. Haploid data with the STRUCTURE format can easily be read into R using read.table or read.csv and then converted using df2genind.

Value

an object of the class genind

Author(s)

Thibaut Jombart [e-mail]

References

Pritchard, J.; Stephens, M. & Donnelly, P. (2000) Inference of population structure using multilocus genotype data. Genetics, 155: 945-959

See Also

import2genind, df2genind, read.fstat, read.genetix, read.genepop

Examples

obj <- read.structure(system.file("files/nancycats.str",package="adegenet"),
  onerowperind=FALSE, n.ind=237, n.loc=9, col.lab=1, col.pop=2, ask=FALSE)

obj

adegenet documentation built on Feb. 16, 2023, 6 p.m.