| addElements | Combine chemical formulae | 
| adductFormula | Calculate a table of adduct (ionic) formulas | 
| adductNames | Retrieve names of supported adducts | 
| adducts | Retrieve names of supported adducts | 
| adjust_lm | Linear model-based normalization of abundance matrices | 
| calculateKendrickMass | Kendrick mass defects | 
| calculateKm | Kendrick mass defects | 
| calculateKmd | Kendrick mass defects | 
| calculateMass | Calculate exact mass | 
| calculateRkmd | Kendrick mass defects | 
| containsElements | Check if one formula is contained in another | 
| convertMtime | Convert migration times to effective mobility | 
| correctRindex | 2-point correction of RIs | 
| countElements | Count elements in a chemical formula | 
| fit_lm | Linear model-based normalization of abundance matrices | 
| formula2mz | Calculate mass-to-charge ratio from a formula | 
| indexRtime | Convert retention times to retention indices | 
| internalStandardMixNames | Get names of internal standard mixes provided by the package | 
| internalStandards | Get definitions for internal standards | 
| isotopicSubstitutionMatrix | Definitions of isotopic substitutions | 
| isotopologues | Identfying isotopologue peaks in MS data | 
| isRkmd | Kendrick mass defects | 
| mass2mz | Calculate mass-to-charge ratio | 
| mclosest | Extract closest values in a pairwise manner between two matrices | 
| multiplyElements | Multiply chemical formulas by a scalar | 
| mz2mass | Calculate neutral mass | 
| pasteElements | Create chemical formula from a named vector | 
| percentMissing | Basic quality assessment functions for metabolomics | 
| quality_assessment | Basic quality assessment functions for metabolomics | 
| rowBlank | Basic quality assessment functions for metabolomics | 
| rowDratio | Basic quality assessment functions for metabolomics | 
| rowPercentMissing | Basic quality assessment functions for metabolomics | 
| rowRsd | Basic quality assessment functions for metabolomics | 
| rsd | Basic quality assessment functions for metabolomics | 
| standardizeFormula | Standardize a chemical formula | 
| subtractElements | subtract two chemical formula |