# Ranges in the contribution of food 3+4+5 in the diet of Mink (try ?Minkdiet)
E <- rbind(Minkdiet$Prey, rep(1, 7))
F <- c(Minkdiet$Mink, 1)
EqA <- c(0, 0, 1, 1, 1, 0, 0) # sum of food 3,4,5
(isoA <- varranges(E, F, EqA = EqA, ispos = TRUE)) # ranges of part of food 3+4+5
# The same, but explicitly imposing positivity
varranges(E, F, EqA = EqA, G = diag(7), H = rep(0, 7))
# The same, but shorter - using lower bound:
varranges(E, F, EqA = EqA, lower=0)
Run the code above in your browser using DataLab