avoid warning "Variable array index in equation can result in slow simulation time" in PressureIndependent damper

[mwetter]

With OCT, the model IBPSA.Fluid.Actuators.Dampers.PressureIndependent triggers during translation the warning

Variable array index in equation can result in slow simulation time

This is during parameter evaluation, and can be avoided with the change

 initial equation
   (kSupSpl, idx_sorted) = Modelica.Math.Vectors.sort(kSupSpl_raw, ascending=true);
-  ySupSpl = ySupSpl_raw[idx_sorted];
-  invSplDer = IBPSA.Utilities.Math.Functions.splineDerivatives(x=kSupSpl, y=ySupSpl);
+  // The sum below is a trick to avoid in OPTIMICA the warning
+  // Variable array index in equation can result in slow simulation time if we were to use
+  // ySupSpl = ySupSpl_raw[idx_sorted];
+  for i in 1:sizeSupSpl loop
+    ySupSpl[i] = sum((if k == idx_sorted[i] then ySupSpl_raw[k] else 0) for k in 1:sizeSupSpl);
+  end for;
+  invSplDer = IBPSA.Utilities.Math.Functions.splineDerivatives(x=kSupSpl_raw, y=ySupSpl_raw);
 equation