# N.x No operator .x for type \<Pl\>

**URL:** <https://community.freefem.org/t/n-x-no-operator-x-for-type-pl/769>\
**Category:** General Discussion\
**Created:** [January 27, 2021, 9:40am UTC](https://community.freefem.org/t/n-x-no-operator-x-for-type-pl/769 "2021-01-27T09:40:20Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**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:** [January 27, 2021, 9:40am UTC](https://community.freefem.org/t/n-x-no-operator-x-for-type-pl/769/1 "2021-01-27T09:40:20Z")

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Can someone help me look at the following error.  
I have a boundary integral:

```
+int1d(th,5)(-(N.x*lx-N.y*ly)*uh-(N.y*lx+N.x*ly)*vh)

```

where (lx, ly) is a local force, and I want to transform it to the global coordinate system.

The compiler complains:

N.x No operator .x for type

Thanks for help in advance!

Yongxing.

---

<div class="post-metadata">

**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [January 28, 2021, 4:52pm UTC](https://community.freefem.org/t/n-x-no-operator-x-for-type-pl/769/2 "2021-01-28T16:52:24Z")

</div>

You use an other variable call N in you script.