| invSLR {easyCODA} | R Documentation |
Inverse of full set of amalgamation balances
Description
Given a full set of amalgamation (or summation) balances (SLRs), compute the inverse (i.e. recover the original parts)
Usage
invSLR(SLRmatrix, part.names=NA, ratio.names=colnames(SLRmatrix))
Arguments
SLRmatrix |
A matrix of amalgamation logratios, one less column than the number of parts |
part.names |
Part names in the reconstructed compositional data matrix |
ratio.names |
Definition of the amalgamation logratios |
Details
The function invSLR computes the original parts, given the amalgamation logratios (CLRs).
The amalgamation logratios are specified in ratio.names in the format num/den where num and den are the numerator and denominator amalgamations respectively.
An amalgamation is specified as "p1&p2&...", where p1, p2, etc. are the parts summed in the amalgamation.
For example, an SLR of the ratio MnO/(CaO+P2O5) would be names as "MnO/CaO&P2O5".
Value
parts |
The reconstructed parts (they add up to 1) |
Author(s)
Michael Greenacre
References
Aitchison, J. (1986), The Statistical Analysis of Compositional Data, Chapman & Hall.
Greenacre, M. (2018), Compositional Data Analysis in Practice, Chapman & Hall / CRC Press.
See Also
Examples
data(veg)
# compute centred logratios
veg.CLR <- CLR(veg)$LR
# invert back to original parts (parts closed to sum to 1)
invALR(veg.CLR)