Present 2 or more images randomly out of a pool? (case 20112)

Hello,

I would like to run an experiment and present 2 or 3 images (pictures) at the same time. I have got 45 pictures of which 2-3 should be shown randomly. The participant should rank or choose them.

I tried to create a test with MediaLab, but I found no way to choose randomly 2-3 images out of a pool. Then, I tried DirectRT and created a stimlist called "pics" like in your examples. But DirectRT is ether crashing the run or showing an error message. It crashed in two ways: directly and does not start or after the introduction slide. The error messages says "Row 3 has a missing value for one of its TIME columns".


I am not sure, maybe the data file is too big. However, I reduced the image size but the problem persists.

I will upload my cvs.file, so maybe you can find my fault.

The input file that you attached to your previous forum post was not properly saved as a .csv file. I reformatted it in Microsoft Notepad and attached it here. Give it a try and let me know if you receive the same error message.

BIG thank you for helping me. As you said the file format was the problem. Somehow if I saved the file via excel as .csv it did not run in DirectRT. Now, I work with Notepad and it works fine (most of the time ;) ).
Carla

You are welcome. And you should be able to work with a spreadsheet program like Excel to create your DirectRT input files. You just need to make sure you save any such file as comma delimited (the .csv format).