Why the unknownGroups.R. function does not require a matrix of isotope fractionation values for each of the sources used in the mixing model?

I have an undetermined stable isotope (SI) trophic model with 2 tracers and 5 sources for a consumer (mix). To address this undetermined model I applied the mixSIR.unknownGroupsR function...

01 January 1970 845 3 View