Read a SSD file and return a genotype matrix.
Get_Genotypes_SSD(SSD_INFO, Set_Index, is_ID = FALSE)SSD_INFO object returned from Open_SSD.
a numeric value of Set index. The set index of each set can be found from SetInfo object of SSD.INFO.
a logical value indicating whether to read SNP ID (default=FALSE). If TRUE, it reads SNP IDs and use them as column names.
A genotype matrix with n rows and m columns, where n is the number of samples and m is the number of SNPs.