# Unitful SymbolicNumericIntegration ambiguity

**URL:** https://discourse.julialang.org/t/unitful-symbolicnumericintegration-ambiguity/89917
**Category:** Modelling & Simulations
**Created:** [November 8, 2022, 3:37am UTC](https://discourse.julialang.org/t/unitful-symbolicnumericintegration-ambiguity/89917 "2022-11-08T03:37:08Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![jar1](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@jar1](https://discourse.julialang.org/u/jar1)
#### Post date: [November 8, 2022, 3:37am UTC](https://discourse.julialang.org/t/unitful-symbolicnumericintegration-ambiguity/89917/1 "2022-11-08T03:37:08Z")

</div>

What is supposed to happen here?

```julia
using Symbolics, SymbolicNumericIntegration, Unitful
@variables x
julia> integrate(9.8u"m/s^2"*x)
ERROR: MethodError: *(::Quantity{Float64, 𝐋 𝐓^-2, …}, ::Num) is ambiguous. Candidates:
  *(a::Number, b::Num) in Symbolics at /home/user/.julia/packages/SymbolicUtils/qulQp/src/methods.jl:71
  *(x::Unitful.AbstractQuantity, y::Number) in Unitful at /home/user/.julia/packages/Unitful/ApCuY/src/quantities.jl:33
Possible fix, define
  *(::Unitful.AbstractQuantity, ::Num)

```

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<div class="post-metadata">

### Author: ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [November 8, 2022, 11:22am UTC](https://discourse.julialang.org/t/unitful-symbolicnumericintegration-ambiguity/89917/2 "2022-11-08T11:22:30Z")

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Symbolics doesn’t use unitful like that. It would require defining the units in the variable declaration, but that might not work with SymbolicNumericIntegration.jl