# Calculating Non-polar contacts

**URL:** <https://gromacs.bioexcel.eu/t/calculating-non-polar-contacts/6230>\
**Category:** User discussions\
**Tags:** analysis-tools\
**Created:** [April 18, 2023, 4:06pm UTC](https://gromacs.bioexcel.eu/t/calculating-non-polar-contacts/6230 "2023-04-18T16:06:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ecemgungor](https://avatars.discourse-cdn.com/v4/letter/e/c89c15/32.png) [@ecemgungor](https://gromacs.bioexcel.eu/u/ecemgungor)\
**Post date:** [April 18, 2023, 4:06pm UTC](https://gromacs.bioexcel.eu/t/calculating-non-polar-contacts/6230/1 "2023-04-18T16:06:46Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Hello! I would like to calculate hydrophobic contacts within a specific domain of my protein. To do that, I created an index file where the hydrophobic residues of this domain are selected. Which command should I use to calculate the possible contacts between these residues?