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

  1. #1
    Join Date
    Jun 2015
    Posts
    3

    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.
    Attached Files Attached Files
    Last edited by jason_reed; 06-24-2015 at 03:24 PM.

  2. #2
    Join Date
    Feb 2013
    Posts
    1,093
    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.
    Attached Files Attached Files
    Jason Reed
    Empirisoft Software Support Specialist

  3. #3
    Join Date
    Jun 2015
    Posts
    3
    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

  4. #4
    Join Date
    Feb 2013
    Posts
    1,093
    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).
    Jason Reed
    Empirisoft Software Support Specialist

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