# Read flow field from pyfrs files

**URL:** <https://pyfr.discourse.group/t/read-flow-field-from-pyfrs-files/192>\
**Category:** General\
**Created:** [19 January 2018 06:52 UTC](https://pyfr.discourse.group/t/read-flow-field-from-pyfrs-files/192 "2018-01-19T06:52:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Will](https://avatars.discourse-cdn.com/v4/letter/w/90ced4/32.png) [@Will](https://pyfr.discourse.group/u/Will)\
**Post date:** [19 January 2018 06:52 UTC](https://pyfr.discourse.group/t/read-flow-field-from-pyfrs-files/192/1 "2018-01-19T06:52:51Z")

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Dear developers,

Is there any way that I can directly read or modify flow field stored in pyfrs files?

Best regards,  
Will

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**Author:** ![p.vincent](https://yyz2.discourse-cdn.com/free1/user_avatar/pyfr.discourse.group/p.vincent/32/225_2.png) [@p.vincent](https://pyfr.discourse.group/u/p.vincent)\
**Post date:** [19 January 2018 09:52 UTC](https://pyfr.discourse.group/t/read-flow-field-from-pyfrs-files/192/2 "2018-01-19T09:52:00Z")

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Hi Will,

The files are HDF5 format, so you can use any tool for viewing/editing HDF5 files.

Peter

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<div class="post-metadata">

**Author:** ![Will](https://avatars.discourse-cdn.com/v4/letter/w/90ced4/32.png) [@Will](https://pyfr.discourse.group/u/Will)\
**Post date:** [20 January 2018 08:40 UTC](https://pyfr.discourse.group/t/read-flow-field-from-pyfrs-files/192/3 "2018-01-20T08:40:35Z")

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Dear Peter,

Through extracting the pyfrs file, what I got is a 3d matrix of 233472_4_27. All elements are hex. 2nd order polynomial.

I think the 233472 means the number of cells/elements. What do the 2nd(4) and 3rd(27) dimensions mean?

Best regards,  
Will