getpaired               Filter ions/peaks based on retention time
                        hierarchical clustering, paired mass
                        distances(PMD) and PMD frequency analysis.
getsda                  Perform structure/reaction directed analysis
                        for peaks list.
getstd                  Find the independent ions for each retention
                        time hierarchical clustering based on PMD
                        relationship within each retention time cluster
                        and isotope and return the index of the std
                        data for each retention time cluster.
globalstd               GlobalStd algorithm with structure/reaction
                        directed analysis
plotpaired              Plot the mass pairs and high frequency mass
                        distances
plotrtg                 Plot the retention time group
plotstd                 Plot the std mass from GlobalStd algorithm
plotstdrt               Plot the std mass from GlobalStd algorithm in
                        certain retention time groups
plotstdsda              Plot the std mass from GlobalStd algorithm in
                        structure directed analysis(SDA) groups
runPMD                  Shiny application for PMD analysis
sda                     A dataset containing common Paired mass
                        distances of substructure, ions replacements,
                        and reaction
spmeinvivo              A peaks list dataset containing 9 samples from
                        3 fish with triplicates samples for each fish
                        from LC-MS.
