# Creating sinusoidal motion in DriftDemo2

**URL:** <https://psychtoolbox.discourse.group/t/creating-sinusoidal-motion-in-driftdemo2/496>\
**Category:** Uncategorized\
**Created:** [November 28, 2012, 5:34pm UTC](https://psychtoolbox.discourse.group/t/creating-sinusoidal-motion-in-driftdemo2/496 "2012-11-28T17:34:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [November 28, 2012, 5:34pm UTC](https://psychtoolbox.discourse.group/t/creating-sinusoidal-motion-in-driftdemo2/496/1 "2012-11-28T17:34:44Z")

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Hello all,  
  
I was hoping to edit DriftDemo2 so that the grating drifts forwards and backwards sinusoidally, rather than continuously drifting in one direction.  
  
However, I do not understand how to do this (I am new to psychtoolbox and programming more generally).. would anyone be able to give me a pointer?  
  
Kind regards,  
Steven