code: private static float calculateExtinctionFromRNA(List<Monomer> monomers) throws CalculationException, IOException {
      LOG.debug("ExtinctionCalculation of RNA");
      float resultSingle = 0.0f;
      float resultDi = 0.0f;
      String previous = "";
      if (monomers.size() == 0) {
        throw new CalculationException("Input sequence cannot be null");
      } else {
        if (monomers.size() == 1) {
          if (monoNucleotideMap.containsKey(monomers.get(0).getNaturalAnalog())) {
            return monoNucleotideMap.get(monomers.get(0).getNaturalAnalog()).floatValue();
  
          } else {
            throw new CalculationException("Unknown nucleotide found");
          }
        }
        for (int i = 0; i < monomers.size(); i++) {
          if (i > 0 && i < monomers.size() - 1) {
            if (monoNucleotideMap.containsKey(monomers.get(i).getNaturalAnalog())) {
              Float value = monoNucleotideMap.get(monomers.get(i).getNaturalAnalog()).floatValue();
              resultSingle += (value.floatValue() * 1.0);
  
            }
          }
          if (previous != "") {
            if (diNucleotideMap.containsKey(previous + monomers.get(i).getNaturalAnalog())) {
              Float value = diNucleotideMap.get(previous + monomers.get(i).getNaturalAnalog()).floatValue();
              resultDi += (value.floatValue() * 1.0);
            }
          }
  
          previous = monomers.get(i).getNaturalAnalog();
        }
  
      }
      resultSingle = BigDecimal.valueOf(resultSingle).floatValue();
      resultDi = BigDecimal.valueOf(resultDi).floatValue();
      return 2 * resultDi - resultSingle;
    }
docs: method to calculate the extinction coefficient for rna
  
  @param monomers all Monomers of the RNA/DNA
  @return extinction coefficient
  @throws CalculationException if the rna contains not valid nucleotides
  @throws IOException