the max number of line to write to big matrix for each loop
priority
'memory' or 'speed'
type.geno
the type of genotype elements
threads
number of thread for transforming
verbose
whether to print the reminder
Value
number of individuals and markers.
Output files:
genotype.desc, genotype.bin: genotype file in bigmemory format
phenotype.phe: ordered phenotype file, same taxa order with genotype file
map.map: SNP information