# One questiong about fespace

**URL:** <https://community.freefem.org/t/one-questiong-about-fespace/2098>\
**Category:** General Discussion\
**Created:** [November 3, 2022, 6:27am UTC](https://community.freefem.org/t/one-questiong-about-fespace/2098 "2022-11-03T06:27:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Yangshen](https://avatars.discourse-cdn.com/v4/letter/y/838e76/32.png) [@Yangshen](https://community.freefem.org/u/Yangshen)\
**Post date:** [November 3, 2022, 6:27am UTC](https://community.freefem.org/t/one-questiong-about-fespace/2098/1 "2022-11-03T06:27:54Z")

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Hello everyone,  
I have the following code. It is an example of optimization algorithm in the tutorial. I don’t know what Ib and Ic define.

 ![图片](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/2X/e/ed8288ff9f151aee27bd73cd38e09af12dee6ba4.png)