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Re: manipulate time


If you want to scan the effect of r, then use r as the variable in Manipulate. You must then supply the values for k, n (or you can add them as manipulated variables).

Manipulate[
 k = 2;
 n = 10;
 sol = DSolve[{\[Theta]'[t] == k i[t], 
    i'[t] == -k \[Theta][t] - r i[t] + 10, 
    i[0] == 0, \[Theta][0] == 0}, {i, \[Theta]}, t];
 ParametricPlot[Evaluate[{i[t], \[Theta][t]} /. sol], {t, 0, n}, 
  PlotRange -> {{-10, 10}, {-1, 15}}],
 {r, 1, 4, 1}
 ]

Themis


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