filterPeaks.msimat: Filter peak list of MSI data
In kbseah/mass2adduct: Mass Spectrometry Imaging Molecular Adduct Finder

Filter peak list of MSI data

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## S3 method for class 'msimat'
filterPeaks(d, how = c("topX", "XofTop", "XofTotal"),
  x = NULL, index = NULL)

`d`	either an `msimat` object, or a data.frame with three columns: `peaks`, `counts`, and `intensities` representing the mass spectrum of the MSI data.
`how`	character; Method to use for filtering (see above)
`x`	numeric; Parameter for the filtering method.
`index`	logical; If input is a dataframe, and `index=TRUE`, then return will be a vector of indices rather than a data frame.