# Alpha underflowed! in BFGS

**URL:** <https://community.freefem.org/t/alpha-underflowed-in-bfgs/2124>\
**Category:** General Discussion\
**Created:** [November 17, 2022, 8:23am UTC](https://community.freefem.org/t/alpha-underflowed-in-bfgs/2124 "2022-11-17T08:23:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lassounon](https://avatars.discourse-cdn.com/v4/letter/l/bbe5ce/32.png) [@lassounon](https://community.freefem.org/u/lassounon)\
**Post date:** [November 17, 2022, 8:23am UTC](https://community.freefem.org/t/alpha-underflowed-in-bfgs/2124/1 "2022-11-17T08:23:04Z")

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![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/2X/8/8706a468f10a79e788b653ddd3d7050c9e5fdea8.png)

Hello everyone,  
I use BFGS to minimize a functional. But the program shows me every time after the results " Alpha underflowed!", I don’t understand how to fix this Freefem error. I wonder if it was myself who had to define the alpha step in question or it is the freefem itself who manages it inside. thank you for helping me.