I want to visually evaluate the effect of changing the parameter "A" in the following Van Der Pol equation. Could anyone tell the way to link the parameter "A" in the Manipulate command to the original "A" in the vdp equation? Thank you in advance.
vdp = NDSolve[{x'[t] == y[t], y'[t] == A (1 - x[t]^2) y[t] - x[t],
x[0] == 0.1, y[0] == 1}, {x[t], y[t]}, {t, 0, 100}]
Manipulate[
Plot[Evaluate[{x[t], y[t]} /. vdp], {t, 0, 100}],
{A, 0, 1}]