Basics

Here we show how to wrap Julia arrays and create an Impero expression.

Numbers

using Impero, Plots, GraphRecipes

@wrapper a=1 b=2;

We can even plot it

c = a+b
plot(c)

and compute values with it

compute(c)

3

Arrays

We can also wrap Arrays or Matrices

using Impero, Plots, GraphRecipes
array_1 = ones(3)
array_2 = ones(3)
@wrapper a=array_1 b=array_2;

b

and compute values with it

c = a+b
compute(c)

3-element Array{Float64,1}:
 2.0
 2.0
 2.0

Note that Impero does not provide an error check for improperly defined Julia objects on this level since

c = a*b

(a*b)

is fine, but compute(c) will yield an error.

User Defined Structs

As long as a user has the operations

unary_operators

7-element Array{Any,1}:
 ["Negative", "-"]
 ["SquareRoot", "√"]
 ["Tanh", "tanh"]
 ["Sin", "sin"]
 ["Cos", "cos"]
 ["Tan", "tan"]
 ["Exp", "exp"]

and

binary_operators

3-element Array{Any,1}:
 ["Add", "+"]
 ["Multiply", "*"]
 ["Exponentiation", "^"]

defined then one can use Impero exactly as before

Converting to Julia Expressions

Any Impero object can be converted to a Julia expression through the to_expr function

@wrapper a=1 b=2
impero_expr = a+b

(a+b)

julia_expr = to_expr(impero_expr)

:((+)(a, b))