emeta_filter: Create e\_meta filter object

In EMSL-Computing/fticRanalysis: Analysis and visualization tools for FT-MS data

Create e\_meta filter object

Description

This function returns an emetaFilt object for use with applyFilt to filter a 'peakData' or 'compoundData' object based on a column in e\_meta

Usage

emeta_filter(ftmsObj, cname)

Arguments

ftmsObj	an object of the class 'peakData' or 'compoundData'
cname	character string giving name of column in e_meta which filter should be based upon.

Value

Object of class 'emetaFilt' that contains the molecule identifier and the e\_meta column of interest. This can be used in conjunction with applyFilt to filter peaks outside of a specified range of values.

Author(s)

Lisa Bramer

Examples

data("exampleProcessedPeakData")
# filter peaks based on Oxygen to Carbon ratio #
filter_object1 = emeta_filter(exampleProcessedPeakData, cname = "OtoC_ratio")
# filter to keep peaks with O:C ratio greater than or equal to 0.5 #
filtered_data = applyFilt(filter_object1, exampleProcessedPeakData, min_val = 0.5)
# filter to keep peaks with O:C ratio greater than or equal to 0.5  and less than or equal to 1 #
filtered_data = applyFilt(filter_object1, exampleProcessedPeakData, min_val = 0.5, max_val = 1)

# filter peaks based on molecular formula #
filter_object2 = emeta_filter(exampleProcessedPeakData, cname = "MolForm")
# filter to keep peaks with molecular formula of C12H14O12
filtered_data = applyFilt(filter_object2, exampleProcessedPeakData, cats = "C12H14O12")
# filter to keep peaks with molecular formula of C12H14O12 and keep NA MolForm peaks
filtered_data = applyFilt(filter_object2, exampleProcessedPeakData, 
                          cats = "C12H14O12", na.rm = FALSE)

EMSL-Computing/fticRanalysis documentation built on March 23, 2024, 8:36 p.m.