akashi_test             akashi test for codon usage
genomic_gc3             genomic gc3 for an multifasta genomic file
low_frequency_op        the function identify low frequency optimal
                        codons
op_corre_CodonW         Identify optimal codons by using the
                        correlative method from Hershberg & Petrov, the
                        input file is from CodonW
op_corre_NCprime        Identify optimal codons by using the
                        correlative method from Hershberg & Petrov, the
                        input file is from NCprime
op_highly               Identify optimal codons by using the highly
                        expressed genes method
op_highly_stats         statistics for the optimal codons
s_index                 S index (Strength of Selected Codon Usage)
sscu-package            Strength of Selected Codon Usage
