# How to build functions from symbolic expressions with symbolics.jl

**URL:** <https://discourse.julialang.org/t/how-to-build-functions-from-symbolic-expressions-with-symbolics-jl/78879>\
**Category:** General Usage\
**Tags:** package, symbolic\
**Created:** [April 1, 2022, 3:25pm UTC](https://discourse.julialang.org/t/how-to-build-functions-from-symbolic-expressions-with-symbolics-jl/78879 "2022-04-01T15:25:57Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![goerch](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/goerch/32/29122_2.png) [@goerch](https://discourse.julialang.org/u/goerch)\
**Post date:** [April 1, 2022, 3:42pm UTC](https://discourse.julialang.org/t/how-to-build-functions-from-symbolic-expressions-with-symbolics-jl/78879/2 "2022-04-01T15:42:16Z")

</div>

I believe you see something like

```julia
The applicable method may be too new: running in world age 32545, while current world is 32546.

```

You could try something like

```julia
using Symbolics
function test()
    @variables x
    p=(1+x)^2
    f_expr=build_function(p,x)
    f=eval(f_expr)
    Base.@invokelatest f(1) # get 4
end
test()

```

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