# Nan value of the 3D homogeneous matrix

**URL:** <https://community.freefem.org/t/nan-value-of-the-3d-homogeneous-matrix/758>\
**Category:** General Discussion\
**Created:** [January 25, 2021, 12:56pm UTC](https://community.freefem.org/t/nan-value-of-the-3d-homogeneous-matrix/758 "2021-01-25T12:56:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chaimaa](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@chaimaa](https://community.freefem.org/u/chaimaa)\
**Post date:** [January 25, 2021, 12:56pm UTC](https://community.freefem.org/t/nan-value-of-the-3d-homogeneous-matrix/758/1 "2021-01-25T12:56:41Z")

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Hi,  
I try to calculate the homogeneous matrix of an effective property.  
unfortunately, I receive this erreor :  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/e6c7995cb47c08db37ae68f701b025a7dd460ffd.png)  
could you help me please  
and what is the meaning of the nan value ?