MSnbase: precSelection – R documentation

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precSelection

Number of precursor selection events

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 <lg390@cam.ac.uk>

Examples

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

MSnbase

Base Functions and Classes for Mass Spectrometry and Proteomics

v2.16.1

Artistic-2.0

Authors

Laurent Gatto, Johannes Rainer and Sebastian Gibb with contributions from Guangchuang Yu, Samuel Wieczorek, Vasile-Cosmin Lazar, Vladislav Petyuk, Thomas Naake, Richie Cotton, Arne Smits, Martina Fisher, Ludger Goeminne, Adriaan Sticker and Lieven Clement.

Initial release