Define boxcar groups

This function takes an MSnExp as input and defines the boxcar groups, i.e. the set of boxcar spectra that match the same full MS1 spectrum. Grouping for full (non-boxcar) spectra are set the NA. Note that the presence of full (non-boxcar) spectra is required to define the groups, and it is assumed that boxcar spectra following a full MS1 spectrum below to the same group. The output of this function is best used to create a new feature variable column used when merging boxcar spectra. See the MSnbaseBoxCar vignette for example code.

bc_groups(x, bc_groups = "bc_groups", fcol = "filterString")

Arguments

x	An MSnExp object containing a set of boxcar spectra.
bc_groups	character(1) indicating the feature variable in which to store the BoxCar groups. Default is bc_groups.
fcol	character(1) indicating the name of the feature variable containing the box data. Default is filterString. See the bc_boxes() function for details.

Value

A numeric of length length(x) with the boxcar groups.