# Starting point of a nonlinear optimization using Ipopt
**URL:** https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959
**Category:** Optimization (Mathematical)
**Tags:** jump
**Created:** [October 18, 2021, 6:01am UTC](https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959 "2021-10-18T06:01:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@FH96](https://discourse.julialang.org/u/FH96)
#### Post date: [October 18, 2021, 6:01am UTC](https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959/1 "2021-10-18T06:01:29Z")
If I don’t specify the staring point in a nonlinear optimization using Ipopt ,what does the solver starts with?
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### Author:  [@blob](https://discourse.julialang.org/u/blob)
#### Post date: [October 18, 2021, 7:14am UTC](https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959/2 "2021-10-18T07:14:43Z")
If you use JuMP, the starting point is zero (and Ipopt will complain if you have a nonlinearity that is undefined at zero, like 1/x). I don’t know if the value is set by JuMP or by Ipopt itself, though.
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### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [October 18, 2021, 7:41am UTC](https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959/3 "2021-10-18T07:41:30Z")
JuMP\* sets the starting point to `0`, or it projects onto the nearest variable bound if `0` is outside that bounds.
Here are the docs for setting different starting values: [Variables · JuMP](https://jump.dev/JuMP.jl/stable/manual/variables/#Start-values)
\*Really Ipopt.jl does this, not JuMP.
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### Author:  [@FH96](https://discourse.julialang.org/u/FH96)
#### Post date: [October 18, 2021, 11:45am UTC](https://discourse.julialang.org/t/starting-point-of-a-nonlinear-optimization-using-ipopt/69959/4 "2021-10-18T11:45:27Z")
All right, thank you both, also thank @odow for the docs 🙏