# Access greenspline's model coefficients

**URL:** <https://forum.generic-mapping-tools.org/t/access-greensplines-model-coefficients/3804>\
**Category:** Q&A\
**Tags:** gmt\
**Created:** [March 31, 2023, 4:35pm UTC](https://forum.generic-mapping-tools.org/t/access-greensplines-model-coefficients/3804 "2023-03-31T16:35:19Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![pwessel](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/pwessel/32/30_2.png) [@pwessel](https://forum.generic-mapping-tools.org/u/pwessel)\
**Post date:** [April 4, 2023, 5:13pm UTC](https://forum.generic-mapping-tools.org/t/access-greensplines-model-coefficients/3804/10 "2023-04-04T17:13:29Z")

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> [@wsja](#):
>
> ```auto
> modnorm += *obs * *obs;
> 
> ```

I dont know what you mean here. obs is an array.

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