plotting - Gaps in plots of equation solution from parameter

I'm trying to plot solution of system of equations as a function of parameter

Manipulate[{
  Quiet[sol = Solve[{Ka*P*L*L == PLL, P0 == P + PLL, r*P0 == L + 2*PLL}, {P, L, PLL}]][[3]];
  complex[x_] := PLL /. sol[[3]] /. r -> x;

  Plot[{
     Hold[Evaluate@D[complex[r], r]],
     Hold[Evaluate@D[-complex[r], {r, 2}]]
     } // Release,
   {r, 0.1, 4},
   PlotStyle -> {Red, Blue}
   ]},
 {Ka, 10000, 10000},
 {P0, 0.5, 1}
 ]

My plot has gaps! Why and how I can eliminate them?

enter image description here

Answer

Thre is a small imaginary part due to numerical errors. Just add Re inside Evaluate:

... Evaluate@Re@D[...] ...

enter image description here

Comments

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