DeSolver giving "NA" as output, but running fully.
Hey :)
W2MH = y[43]; #number of infected vaccinated males high risk
infected with non-vaccine strain
length(y0)
[1] 42 As a sidenote, would you mind sharing the flow diagram with me, so I can show it to my students doing a practical with DeSolve, as example of a contemporary model? Cheers, Tsjerk
Tsjerk A. Wassenaar, Ph.D. [[alternative HTML version deleted]]