# Problems creating Plots.jl recipes for custom types
**URL:** https://discourse.julialang.org/t/problems-creating-plots-jl-recipes-for-custom-types/23654
**Category:** General Usage
**Tags:** plots, recipe
**Created:** [April 29, 2019, 3:21pm UTC](https://discourse.julialang.org/t/problems-creating-plots-jl-recipes-for-custom-types/23654 "2019-04-29T15:21:06Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@srb](https://discourse.julialang.org/u/srb)
#### Post date: [April 29, 2019, 3:21pm UTC](https://discourse.julialang.org/t/problems-creating-plots-jl-recipes-for-custom-types/23654/1 "2019-04-29T15:21:06Z")
I’m trying to implement plotting functions for my custom types as seen in [Recipes · Plots](http://docs.juliaplots.org/latest/recipes/).
However, I cannot seem to make it work using custom parametric types. For example, take the following struct and recipe.
```julia
struct Point{T<: Integer}
x::T
y::T
end
@recipe f(::Type{Point},P::Point) = P.x, P.y
```
That seems to be what I have to implement in order to be able to convert a `Point` to something that can be plotted ( a tuple of integers).
However, when I do that I get the following output:
```julia
julia> using Plots
julia> struct Point{T<:Integer}
x::T
y::T
end
julia> @recipe f(::Type{Point}, P::Point) = P.x, P.y
julia> P = Point(3,3)
Point{Int64}(3, 3)
julia> plot(P)
ERROR: No user recipe defined for Point{Int64}
[...]
```
I also tried to define a “User Recipe” for a given `Point` in the following manner:
```julia
julia> @recipe function f(P::Point)
x = P.x
y = P.y
seriestype --> :scatter
[(x,y)]
end
```
This does work when I call `plot(P)`and gives the correct output. However it feels a bit “hacky” having to return an array of 1 tuple instead of just the tuple. It also does not work on arrays of `Point`s:
```julia
julia> [P,P,P]
3-element Array{Point{Int64},1}:
Point{Int64}(3, 3)
Point{Int64}(3, 3)
Point{Int64}(3, 3)
julia> plot(ans)
ERROR: No user recipe defined for Point{Int64}
[...]
```
Can someone give some pointers on how to implement this? Specially the part about it working on arrays of points, since that is what I can’t seem to get to work.
---
### Author:  [@BeastyBlacksmith](https://discourse.julialang.org/u/BeastyBlacksmith)
#### Post date: [April 29, 2019, 3:51pm UTC](https://discourse.julialang.org/t/problems-creating-plots-jl-recipes-for-custom-types/23654/2 "2019-04-29T15:51:38Z")
> [@srb](#):
>
> ```julia
> julia> @recipe f(::Type{Point}, P::Point) = P.x, P.y
>
> ```
If you define it like this, you have to call it like this, e.g.
```julia
plot( Point, P )
```
But it won’t show anything. But, you figured the right solution already out.
And finally you could specify the recipe for Arrays of Points like so
```julia
@recipe f( AP::AbstractArray{<:Point} ) = map( p->p.x, AP), map( p->p.y, AP )
```
---
### Author:  [@srb](https://discourse.julialang.org/u/srb)
#### Post date: [April 29, 2019, 4:16pm UTC](https://discourse.julialang.org/t/problems-creating-plots-jl-recipes-for-custom-types/23654/3 "2019-04-29T16:16:10Z")
I assumed defining a recipe for `Point` would call each of them individually when passed an array, but this solution did work, thanks!