Switch initial state guess added

Author: matthew-kapp

src/Electrical/Analog/ideal_components.jl

@@ -419,20 +419,22 @@ G will therefore be 0 when the input is false [0] and G_on when the input is tru
 # Parameters:
     
     - `Gon`: [`S`] Conductance when switch is closed. Value should be finite to avoid a singularity.
+    - `state_init`: Initial guess for the state of the switch.
 """
 @mtkmodel Switch begin
     @extend v, i = oneport = OnePort()
 
     @parameters begin
         Gon = 1e5, [description = "Conductance when switch is closed"]
+        state_init = false, [description = "Initial guess for the state of the switch"]
     end
 
     @components begin
         input = RealInput()
     end
 
     @variables begin
-        state(t)::Bool
+        state(t)::Bool, [guess = state_init]
         G(t)
     end
 

test/Electrical/analog.jl

@@ -723,7 +723,7 @@ end
             switch = Switch()
             voltage = Voltage()
             resistor = Resistor(R = R)
-            capacitor = Capacitor(C = C, v = 0.0)
+            capacitor = Capacitor(C = C)
             ground = Ground()
         end
 
@@ -738,7 +738,7 @@ end
     end
 
     @mtkbuild sys = SwitchTest()
-    prob = ODEProblem(sys, [], (0.0, 25.0))
+    prob = ODEProblem(sys, [sys.capacitor.v => 0.0], (0.0, 25.0))
     sol = solve(prob, Rodas4())
 
     @test SciMLBase.successful_retcode(sol)