# What information does extended trace give in nlsolve jl

**URL:** <https://discourse.julialang.org/t/what-information-does-extended-trace-give-in-nlsolve-jl/121391>\
**Category:** General Usage\
**Tags:** question\
**Created:** [October 16, 2024, 4:40pm UTC](https://discourse.julialang.org/t/what-information-does-extended-trace-give-in-nlsolve-jl/121391 "2024-10-16T16:40:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![usaer](https://avatars.discourse-cdn.com/v4/letter/u/b9bd4f/32.png) [@usaer](https://discourse.julialang.org/u/usaer)\
**Post date:** [October 16, 2024, 4:40pm UTC](https://discourse.julialang.org/t/what-information-does-extended-trace-give-in-nlsolve-jl/121391/1 "2024-10-16T16:40:11Z")

</div>

Hi,  
I am interested in what info does extended trace give in [NLsolve.jl](https://juliahub.com/ui/Packages/General/NLsolve).  
A particular trace reads as

```julia
Iter f(x) inf-norm Step 2-norm 
------ -------------- --------------
     0 1.000000e-01 NaN
 * f(x): [0.1, 0.0]
 * g(x): [-30.58680355728619 0.0; 0.0 -1.0]
 * x: [0.0, 0.0]
 * delta: NaN
 * rho: NaN
     1 2.339203e-02 3.269384e-03
 * f(x): [0.02339203027677505, 2.3392030276774175e-7]
 * g(x): [-16.27705485965006 0.0; 0.00014309748697635279 -1.0001430974869765]
 * x: [0.0032693837985623268, 0.0]
 * delta: 1.0
 * rho: 0.945281291947572

```