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[SOLVED] Mathematica acting strange


Well-known member
Feb 1, 2012
s := NDSolve[{x'[t] == -x[t] + 0.08*y[t] + x[t]^2*y[t], 
    y'[t] == .6 - 0.08*y[t] - x[t]^2*y[t], x[0] == 0, y[0] == 0}, {x, 
    y}, {t, 100}];
ParametricPlot[Evaluate[{x[t], y[t] /. s}], {t, 0, 100}]
I know for a fact this code should plot a limit cycle since I used it last year. When I enter this into Mathematica, the plot is empty. What would be causing this? I cleared all variables. I restarted Mathematica.