# Number of degrees of freedom

**URL:** https://community.freefem.org/t/number-of-degrees-of-freedom/523
**Category:** General Discussion
**Created:** [July 27, 2020, 5:49pm UTC](https://community.freefem.org/t/number-of-degrees-of-freedom/523 "2020-07-27T17:49:42Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)
#### Post date: [July 27, 2020, 6:53pm UTC](https://community.freefem.org/t/number-of-degrees-of-freedom/523/2 "2020-07-27T18:53:44Z")

</div>

```auto
mesh ThCoil = trunc(Th, region == Coil);
varf vPoi(u,v)
    =int2d(ThCoil) (sig * Grad(u)' * Grad(v))//'
    +on(CoilTerminalIn, u=0)
    +on(CoilTerminalOut, u=1);
fespace PhCoil(ThCoil, P1);
matrix Poi = vPoi(PhCoil,PhCoil);
cout << "sizePoi " << Poi.n << endl;

```

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