Select a subset of isotopes from a dataset

Description

Extracts the intercepts, covariance matrix, etc. of a selection of isotopes from a larger dataset

Usage

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getmasses(x, ...)

## Default S3 method:
getmasses(x, ...)

## S3 method for class 'timeresolved'
getmasses(x, mass, invert = FALSE, ...)

## S3 method for class 'logratios'
getmasses(x, num, den, invert = FALSE, ...)

Arguments

x

an object of class logratios, timeresolved, PHdata or redux.

...

other arguments

mass

a vector of strings denoting the masses of interest

invert

boolean parameter indicating whether the selection should be inverted (default = FALSE)

num

vector of strings indicating the numerator isotopes

den

vector of string indicating the denominator isotopes

Value

an object of the same class as x

Examples

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kfile <- system.file("K-glass.csv",package="ArArRedux")
masses <- c("Ar37","Ar38","Ar39","Ar40","Ar36")
mk <- loaddata(kfile,masses)
lk <- fitlogratios(blankcorr(mk,"EXB#","K:"),"Ar40")
k <- getmasses(lk,"Ar39","Ar40") # subset on the relevant isotopes
plotcorr(k)

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