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| I ran into this problem using a slightly complicated model, but made as simple an example as I could to identify the exact problem. What I found was that, when solving a system of differential equations numerically, if NDSolve was asked to deal with... |
| [mcode]ecosh = NDSolve[{ex'[t] == r - (a*h*ex[t] ep[t]), ep'[t] == (f*a*ex[t]*ep[t])/(1 + a*h*ex[t]) - q*ep[t], ex[0] == 300, ep[0] == 100} /. {a -> 0.1, h -> 0.1, q -> 0.115, f -> 0.15, r -> 0}, {ex, ep}, {t, 0, 50}]... |