Arguments
file
a file name specified by either a variable of mode character,
or a quoted string.
header
a logical specifying whether the first line of the data
file gives the names of the loci (TRUE by default).
loci.sep
the character(s) separating the loci (columns) in the
data file (a space by default).
allele.sep
the character(s) separating the alleles for each locus
in the data file (a slash by default).
col.pop
specifies whether one of the column of the data file
identifies the population; default "none", otherwise an
integer giving the number of the column.
col.loci
a vector of integers specifying the indices of the
columns that are loci. By default, all columns are taken as loci
except one labelled "population", if present.
skip
an integer specifying the number of lines in the data file
to be skipped before reading the data.