An object of class cross. See
read.cross for details.
format
Specifies whether to write the data in comma-delimited
or Mapmaker format.
filestem
A character string giving the first part of the output
file names (the bit before the dot). In Windows, use forward
slashes ("/") or double backslashes ("\\") to
specify directory trees.
chr
A vector specifying for which chromosomes genotype data
should be written.
digits
Number of digits to which phenotype values should be
rounded.
Details
Comma-delimited format: a single csv file is created in the format
read by read.cross.
Mapmaker format: Data is written to two files.
Suppose filestem="file". Then "file.raw" will contain
the genotype and phenotype data, and "file.prep" will contain
the necessary code for defining the chromosome assignments, marker
order, and inter-marker distances.