hires Paul Cochrane This is a stiff system of 8 non-linear ODEs. It refers to "High Irradiance RESponse" of photomorphogenesis on the basis of phytochrome, by means of a chemical reaction involving eight reactants. The problem originates from plant physiology and is given as part of the "Test set for initial value problem solvers" http://www.dm.uniba.it/~testset t yes yes yes yes main 1 main complex y1 y2 y3 y4 y5 y6 y7 y8 RK4IP 321.8122 1000000 10000 main no 10000 y1Out y2Out y3Out y4Out y5Out y6Out y7Out y8Out