Merge pull request #104 from vpuri3/patch-1

Update func.jl

Author: ChrisRackauckas

src/func.jl

@@ -90,7 +90,7 @@ end
 
 function FunctionOperator(op,
                           input::AbstractVecOrMat,
-                          output::AbstractVecOrMat;
+                          output::AbstractVecOrMat =  input;
 
                           isinplace::Union{Nothing,Bool}=nothing,
                           outofplace::Union{Nothing,Bool}=nothing,