# FreeFem interpolation

**URL:** <https://community.freefem.org/t/freefem-interpolation/1082>\
**Category:** General Discussion\
**Created:** [July 5, 2021, 7:38am UTC](https://community.freefem.org/t/freefem-interpolation/1082 "2021-07-05T07:38:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![yongxing](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/yongxing/32/3632_2.png) [@yongxing](https://community.freefem.org/u/yongxing)\
**Post date:** [July 5, 2021, 7:38am UTC](https://community.freefem.org/t/freefem-interpolation/1082/1 "2021-07-05T07:38:52Z")

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Dear all,

When using **interpolate()** or t**ransferMat()**, the interpolation matrix is always **a linear interpolation** , or the interpolation **uses FEM shape function** (therefore it could be high order interpolation for the high order fespace)?

Best,  
Yongxing.

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [July 5, 2021, 9:59am UTC](https://community.freefem.org/t/freefem-interpolation/1082/2 "2021-07-05T09:59:11Z")

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It’s of the same order as your `fespace`s.