# How to Randomize the presentation of stimulus without creating a tool

**URL:** <https://discourse.psychopy.org/t/how-to-randomize-the-presentation-of-stimulus-without-creating-a-tool/6098>\
**Category:** Builder\
**Created:** [December 11, 2018, 7:27pm UTC](https://discourse.psychopy.org/t/how-to-randomize-the-presentation-of-stimulus-without-creating-a-tool/6098 "2018-12-11T19:27:13Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![triki](https://avatars.discourse-cdn.com/v4/letter/t/ba9def/32.png) [@triki](https://discourse.psychopy.org/u/triki)\
**Post date:** [December 11, 2018, 7:27pm UTC](https://discourse.psychopy.org/t/how-to-randomize-the-presentation-of-stimulus-without-creating-a-tool/6098/1 "2018-12-11T19:27:13Z")

</div>

I’m working with psychopy builder (version 1.90.1) in a recognition task of weapons in different contexts. I would like to randomize the presentation of the stimulus, but the problem is that every picture has its own size and its own polygon attached to it, so I can’t create a file containing all pictures. How could I randomize the presentation since the begining without creating a loop? I need the randomization to be present from the first presentation of the stimulus.

---

<div class="post-metadata">

**Author:** ![Michael](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/michael/32/16_2.png) [@Michael](https://discourse.psychopy.org/u/Michael)\
**Post date:** [December 12, 2018, 2:45am UTC](https://discourse.psychopy.org/t/how-to-randomize-the-presentation-of-stimulus-without-creating-a-tool/6098/2 "2018-12-12T02:45:53Z")

</div>

Hello, you need to actually describe your experimental design and its constraints to us. “Randomisation” can mean an immense number of things.