create extra constructors

Author: juhyun-kim-ucla

src/VarianceComponentModels.jl

@@ -94,6 +94,19 @@ function TwoVarCompModelRotate(
   TwoVarCompModelRotate{eltype(Brot), typeof(Brot)}(Brot, eigval, eigvec, logdetΣ2)
 end
 
+"""
+    TwoVarCompModelRotate(twovarcomp)
+
+Constructor of [`TwoVarCompModelRotate`](@ref) instance from a 
+[`TwoVarCompModelRotate`](@ref) instance itself. 
+"""
+function TwoVarCompModelRotate(
+  twovarcomp::TwoVarCompModelRotate{T}) where T <: AbstractFloat
+
+  ## JK ###
+  twovarcomp
+end 
+
 """
     TwoVarCompModelRotate(vcmodel)
 
@@ -197,6 +210,19 @@ function TwoVarCompVariateRotate(
     eigval, eigvec, logdetV2)
 end
 
+"""
+    TwoVarCompVariateRotate(twovarcomp)
+
+Constructor of a [`TwoVarCompVariateRotate`](@ref) instance from a
+[`TwoVarCompVariateRotate`](@ref) instance itself.
+"""
+function TwoVarCompVariateRotate(
+  twovarcomp::TwoVarCompVariateRotate{T}) where T <: AbstractFloat
+
+  ## JK ###
+  twovarcomp
+end 
+
 """
     TwoVarCompVariateRotate(vcobs)