# Effect of a parameter on the result

**URL:** <https://community.freefem.org/t/effect-of-a-parameter-on-the-result/1495>\
**Category:** General Discussion\
**Created:** [February 15, 2022, 2:57am UTC](https://community.freefem.org/t/effect-of-a-parameter-on-the-result/1495 "2022-02-15T02:57:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Qianrui](https://avatars.discourse-cdn.com/v4/letter/q/9fc348/32.png) [@Qianrui](https://community.freefem.org/u/Qianrui)\
**Post date:** [February 15, 2022, 2:57am UTC](https://community.freefem.org/t/effect-of-a-parameter-on-the-result/1495/1 "2022-02-15T02:57:52Z")

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![屏幕截图 2022-02-15 105354](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/9bba0518f053427025b97634408abc9034cfaf7a.png)  
Parameter w = [0,1], but when parameter W \> 0.1 during programming, the matrix is irreversible. Why? There have been articles about this equation in w = [0,1], which has a very good well posedness.