fix and test type stability in system concatenation (#643)

* use getproperty instead of getfield for LQG

* merge

* merge

* fix and test type stability in system concatenation

src/connections.jl

@@ -41,13 +41,13 @@ append(systems::LTISystem...) = append(promote(systems...)...)
 
 function Base.vcat(systems::DelayLtiSystem...)
     P = vcat_1([sys.P for sys in systems]...) # See PartitionedStateSpace
-    Tau = vcat([sys.Tau for sys in systems]...)
+    Tau = reduce(vcat, sys.Tau for sys in systems)
     return DelayLtiSystem(P, Tau)
 end
 
 function Base.hcat(systems::DelayLtiSystem...)
     P = hcat_1([sys.P for sys in systems]...)  # See PartitionedStateSpace
-    Tau = vcat([sys.Tau for sys in systems]...)
+    Tau = reduce(vcat, sys.Tau for sys in systems)
     return DelayLtiSystem(P, Tau)
 end
 
@@ -59,9 +59,9 @@ function Base.vcat(systems::ST...) where ST <: AbstractStateSpace
         error("All systems must have same input dimension")
     end
     A = blockdiag([s.A for s in systems]...)
-    B = vcat([s.B for s in systems]...)
+    B = reduce(vcat, s.B for s in systems)
     C = blockdiag([s.C for s in systems]...)
-    D = vcat([s.D for s in systems]...)
+    D = reduce(vcat, s.D for s in systems)
     timeevol = common_timeevol(systems...)
     return ST(A, B, C, D, timeevol)
 end
@@ -73,7 +73,7 @@ function Base.vcat(systems::TransferFunction...)
         error("All systems must have same input dimension")
     end
     timeevol = common_timeevol(systems...)
-    mat = vcat([s.matrix for s in systems]...)
+    mat = reduce(vcat, s.matrix for s in systems)
 
     return TransferFunction(mat, timeevol)
 end
@@ -89,8 +89,8 @@ function Base.hcat(systems::ST...) where ST <: AbstractStateSpace
     timeevol = common_timeevol(systems...)
     A = blockdiag([s.A for s in systems]...)
     B = blockdiag([s.B for s in systems]...)
-    C = hcat([s.C for s in systems]...)
-    D = hcat([s.D for s in systems]...)
+    C = reduce(hcat, s.C for s in systems)
+    D = reduce(hcat, s.D for s in systems)
 
     return ST(A, B, C, D, timeevol)
 end
@@ -102,12 +102,12 @@ function Base.hcat(systems::TransferFunction...)
         error("All systems must have same output dimension")
     end
     timeevol = common_timeevol(systems...)
-    mat = hcat([s.matrix for s in systems]...)
+    mat = reduce(hcat, s.matrix for s in systems)
 
     return TransferFunction(mat, timeevol)
 end
 
-Base.hcat(systems::LTISystem...) = hcat(promote(systems...)...)
+Base.hcat(systems::LTISystem...) = reduce(hcat, promote(systems...))
 
 function Base._cat_t(::Val{1}, T::Type{<:LTISystem}, X...)
         vcat(convert.(T, X)...)

test/test_connections.jl

@@ -28,6 +28,8 @@ D_022 = ss(4*eye_(2), 0.005)
 @test [D_022 D_222] == ss(eye_(2), [0 0 1 0; 0 0 0 2], [1 0; 0 1], [4 0 0 0; 0 4 0 0], 0.005)
 @test [D_022; D_222] == ss(eye_(2), [1 0; 0 2], [0 0; 0 0; 1 0; 0 1], [4 0; 0 4; 0 0; 0 0], 0.005)
 
+@inferred hcat(C_111, C_221)
+
 @test series(C_111, C_212) == C_212*C_111
 @test parallel(C_111, C_211) == C_111 + C_211
 

test/test_statespace.jl

@@ -11,31 +11,31 @@
     # SCALARS
     for SS in (StateSpace, HeteroStateSpace), SS2 in (StateSpace, HeteroStateSpace)
         a_2 = [-5 -3; 2 -9]
-        CS_111 = SS(-5, 2, 3, [0])
-        CS_111_d = SS([3], 2, 1, 1)
-        CS_211 = SS(a_2, [1; 2], [1 0], 0)
-        CS_221 = SS(a_2, [1 0; 0 2], [1 0], 0)
-        CS_222 = SS(a_2, [1 0; 0 2], eye_(2), 0)
+        CS_111 = @inferred SS(-5, 2, 3, [0])
+        CS_111_d = @inferred SS([3], 2, 1, 1)
+        CS_211 = @inferred SS(a_2, [1; 2], [1 0], 0)
+        CS_221 = @inferred SS(a_2, [1 0; 0 2], [1 0], 0)
+        CS_222 = @inferred SS(a_2, [1 0; 0 2], eye_(2), 0)
 
         # CONTINUOUS
         a_1 = [-5]
-        C_111 = SS(a_1, [2], [3], [0])
-        C_211 = SS2(a_2, [1; 2], [1 0], [0])
-        C_212 = SS2(a_2, [1; 2], eye_(2), [0; 0])
-        C_221 = SS2(a_2, [1 0; 0 2], [1 0], [0 0])
-        C_222 = SS(a_2, [1 0; 0 2], eye_(2), zeros(Int,2,2))
-        C_222_d = SS(a_2, [1 0; 0 2], eye_(2), eye_(2))
-        C_022 = SS(4.0*eye_(2))
+        C_111 = @inferred SS(a_1, [2], [3], [0])
+        C_211 = @inferred SS2(a_2, [1; 2], [1 0], [0])
+        C_212 = @inferred SS2(a_2, [1; 2], eye_(2), [0; 0])
+        C_221 = @inferred SS2(a_2, [1 0; 0 2], [1 0], [0 0])
+        C_222 = @inferred SS(a_2, [1 0; 0 2], eye_(2), zeros(Int,2,2))
+        C_222_d = @inferred SS(a_2, [1 0; 0 2], eye_(2), eye_(2))
+        C_022 = @inferred SS(4.0*eye_(2))
 
         # DISCRETE
         da_1 = [-0.5]
         da_2 = [0.2 -0.8; -0.8 0.07]
-        D_111 = SS(da_1, [2], [3], [0], 0.005)
-        D_211 = SS2(da_2, [1; 2], [1 0], [0], 0.005)
-        D_221 = SS2(da_2, [1 0; 0 2], [1 0], [0 0], 0.005)
-        D_222 = SS(da_2, [1 0; 0 2], eye_(2), zeros(2,2), 0.005)
-        D_222_d = SS(da_2, [1 0; 0 2], eye_(2), eye_(2), 0.005)
-        D_022 = SS(4.0*eye_(2), 0.005)
+        D_111 = @inferred SS(da_1, [2], [3], [0], 0.005)
+        D_211 = @inferred SS2(da_2, [1; 2], [1 0], [0], 0.005)
+        D_221 = @inferred SS2(da_2, [1 0; 0 2], [1 0], [0 0], 0.005)
+        D_222 = @inferred SS(da_2, [1 0; 0 2], eye_(2), zeros(2,2), 0.005)
+        D_222_d = @inferred SS(da_2, [1 0; 0 2], eye_(2), eye_(2), 0.005)
+        D_022 = @inferred SS(4.0*eye_(2), 0.005)
 
         # Definition of input, output and state names
         C_222_d_n = SS(a_2, [1 0; 0 2], eye_(2), eye_(2))

test/test_transferfunction.jl

@@ -9,21 +9,21 @@ s = tf("s")
 @inferred 1/s
 
 # CONTINUOUS
-C_111 = tf([1, 2], [1, 5])
-C_211 = tf([1, 2, 3], [1, 8, 15])
-C_212 = tf(vecarray(2, 1,[1, 2, 3], [1, 2]), vecarray(2, 1, [1, 8, 15], [1, 8, 15]))
-C_221 = tf(vecarray(1, 2,[1, 2, 3], [1, 2]), vecarray(1, 2, [1, 8, 15], [1, 8, 15]))
+C_111 = @inferred tf([1, 2], [1, 5])
+C_211 = @inferred tf([1, 2, 3], [1, 8, 15])
+C_212 = @inferred tf(vecarray(2, 1,[1, 2, 3], [1, 2]), vecarray(2, 1, [1, 8, 15], [1, 8, 15]))
+C_221 = @inferred tf(vecarray(1, 2,[1, 2, 3], [1, 2]), vecarray(1, 2, [1, 8, 15], [1, 8, 15]))
 C_222 = [C_221; C_221]
-C_022 = tf(4*[1 0; 0 1])
-s = tf("s")
+C_022 = @inferred tf(4*[1 0; 0 1])
+s = @inferred tf("s")
 
 # DISCRETE
-D_111 = tf([1, 2], [1, -0.5], 0.005)
-D_211 = tf([1, 2, 3], [1, -0.2, -0.15], 0.005)
-D_221 = tf(vecarray(1, 2, [1, 2, 3], [1, 2]), vecarray(1, 2, [1, -0.2, -0.15], [1, -0.2, -0.15]), 0.005)
+D_111 = @inferred tf([1, 2], [1, -0.5], 0.005)
+D_211 = @inferred tf([1, 2, 3], [1, -0.2, -0.15], 0.005)
+D_221 = @inferred tf(vecarray(1, 2, [1, 2, 3], [1, 2]), vecarray(1, 2, [1, -0.2, -0.15], [1, -0.2, -0.15]), 0.005)
 D_222 = [D_221; D_221]
-D_022 = tf(4*[1 0; 0 1], 0.005)
-z = tf("z", 0.005)
+D_022 = @inferred tf(4*[1 0; 0 1], 0.005)
+z = @inferred tf("z", 0.005)
 
 # TESTS
 # Constructors