# Export point value

**URL:** https://festim.discourse.group/t/export-point-value/61
**Category:** User Support
**Created:** [July 22, 2024, 12:30pm UTC](https://festim.discourse.group/t/export-point-value/61 "2024-07-22T12:30:32Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![xinshen](https://yyz2.discourse-cdn.com/free1/user_avatar/festim.discourse.group/xinshen/32/194_2.png) [@xinshen](https://festim.discourse.group/u/xinshen)
#### Post date: [July 22, 2024, 12:30pm UTC](https://festim.discourse.group/t/export-point-value/61/1 "2024-07-22T12:30:32Z")

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Hi everyone, I have a few questions when I want to export some values at some specific points using class `PointValue`. [https://festim.readthedocs.io/en/latest/userguide/export\_post\_processing.html](https://festim.readthedocs.io/en/latest/userguide/export_post_processing.html)

1. Is the coordinate in class `PointValue` corresponding to the coordinate of the geometry in Salome?
2. Can I export any point I want within the domain in the model?
3. There are no arguments such as `folder` and `filename` in the class `PointValue`, so I was wondering that where can I find the exported file of point values?

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### Author: ![remidm](https://yyz2.discourse-cdn.com/free1/user_avatar/festim.discourse.group/remidm/32/4_2.png) [@remidm](https://festim.discourse.group/u/remidm)
#### Post date: [July 22, 2024, 12:37pm UTC](https://festim.discourse.group/t/export-point-value/61/2 "2024-07-22T12:37:25Z")

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> [@xinshen](#):
>
> There are no arguments such as `folder` and `filename` in the class `PointValue`, so I was wondering that where can I find the exported file of point values?

Xin, [`PointValue`](https://festim.readthedocs.io/en/latest/userguide/export_post_processing.html#point-value) behaves as a `DerivedQuantity` class so you use it this way:

```python
my_derived_quantities = F.DerivedQuantities(
    [
        ..., # other derived quantities
        F.PointValue(field="solute", x=0.5),
    ],
    filename="my_filename.csv",
)

```

> [@xinshen](#):
>
> Is the coordinate in class `PointValue` corresponding to the coordinate of the geometry in Salome?

the geometry in SALOME and the geometry of the FESTIM model should be the same right?

But yes it should be the coordinate in that mesh. The coordinate would be for instance (0.5, 0.5) in 2D and, (0.5, 0.5, 0.5) in 3D.

> [@xinshen](#):
>
> Can I export any point I want within the domain in the model?

Yes

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<div class="post-metadata">

### Author: ![xinshen](https://yyz2.discourse-cdn.com/free1/user_avatar/festim.discourse.group/xinshen/32/194_2.png) [@xinshen](https://festim.discourse.group/u/xinshen)
#### Post date: [July 22, 2024, 1:59pm UTC](https://festim.discourse.group/t/export-point-value/61/3 "2024-07-22T13:59:23Z")

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Hi Remi, thank you so much!