findFragment is used to find spectra that contain a specific fragment
ion. Its sister function is
findNL, which finds specific
neutral losses. Both functions work analogous to
findFragment(featlist, mz, tolerance = 1e-05)
a list that contains only objects of class
The mass-to-charge ratio of the fragment ion of interest.
The m/z tolerance for the fragment ion search.
If the respective fragment is only found in one spectrum, the output
is an object of class
MS2spectrum; if it is found in
more than one spectrum, the output is a list of
1 2 3 4
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