# Sub plus (₊) instead of dot in the dot notation in equations displayed by ModelingToolkit

**URL:** <https://discourse.julialang.org/t/sub-plus-instead-of-dot-in-the-dot-notation-in-equations-displayed-by-modelingtoolkit/61113>\
**Category:** Modelling & Simulations\
**Tags:** question, modelingtoolkit\
**Created:** [May 13, 2021, 11:13pm UTC](https://discourse.julialang.org/t/sub-plus-instead-of-dot-in-the-dot-notation-in-equations-displayed-by-modelingtoolkit/61113 "2021-05-13T23:13:10Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![zdenek\_hurak](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/zdenek_hurak/32/53118_2.png) [@zdenek\_hurak](https://discourse.julialang.org/u/zdenek_hurak)\
**Post date:** [June 29, 2021, 5:36pm UTC](https://discourse.julialang.org/t/sub-plus-instead-of-dot-in-the-dot-notation-in-equations-displayed-by-modelingtoolkit/61113/4 "2021-06-29T17:36:45Z")

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I am hesitating as for where to place it, perhaps it could be more appropriate in the Issues, but I will give it a try here.

Looking at one recent problem [[Update parameters in ModelingToolkit using callbacks](https://discourse.julialang.org/t/update-parameters-in-modelingtoolkit-using-callbacks/63770)] here at Discourse, I noticed that the old issue that we discussed here still persist:

```julia
julia> states(sys)
3-element Vector{Any}:
 model₊y(t)
 myController₊integralError(t)
 myController₊manipulatedVariable(t)

```

So, was it finally decided to keep the `₊` as the separation character after the issue was closed?

Note also that in the legend in the figure [https://global.discourse-cdn.com/julialang/original/3X/3/e/3e3d1d70af56d0610bd595aa51e64cd0e8eae60a.png](https://global.discourse-cdn.com/julialang/original/3X/3/e/3e3d1d70af56d0610bd595aa51e64cd0e8eae60a.png) in that post, some entries use `.` and some `₊`.

May I kindly attract @YingboMa 's attention to this? Many thanks.

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_[View the full topic](https://discourse.julialang.org/t/sub-plus-instead-of-dot-in-the-dot-notation-in-equations-displayed-by-modelingtoolkit/61113)._