precSelection: Number of precursor selection events

In MSnbase: Base Functions and Classes for Mass Spectrometry and Proteomics

Description

precSelection computes the number of selection events each precursor ions has undergone in an tandem MS experiment. This will be a function of amount of peptide loaded, chromatography efficiency, exclusion time,... and is useful when optimising and experimental setup. This function returns a named integer vector or length equal to the number of unique precursor MZ values in the original experiment. See n parameter to set the number of MZ significant decimals.

precSelectionTable is a wrapper around precSelection and returns a table with the number of single, 2-fold, ... selection events.

Usage

precSelection(object,n)

Arguments

object	An instane of class "MSnExp".
n	The number of decimal places to round the precursor MZ to. Is passed to the round function.

Value

A named integer in case of precSelection and a table for precSelectionTable.

Author(s)

Laurent Gatto <[e-mail]>

Examples

precSelection(itraqdata)
precSelection(itraqdata,n=2)
precSelectionTable(itraqdata)
## only single selection event in this reduced exeriment

MSnbase documentation built on Jan. 23, 2021, 2 a.m.