Choose input file depending on participant id

Online experiments
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1

Hi, I can’t find a way to use different input file depending on participant’s id. What I need is to somehow implement this: “if participant’s id%2 !=0, choose file 1, else use file 2”.

I tried solutions proposed here: Selecting condition files depending on participant number. It gives me error “Conditions file not found.”

I will run it online, so it’s important that everything can be converted to javascript.

Any thoughts?

2

Hello Hejlo

here some thoughts

conditionFile = " "
if int(expInfo['participant'])%2 == 0:
    conditionFile = "group1.xlsx"
else:
    conditionFile = "group2.xlsx"

should autotranslate to JS. Call the conditionFile in the relevant loop with $conditionFile.

Best wishes Jens

3

Thanks Jens! It worked perfectly when I run the experiment locally, but when I try to pilot it from Pavlovia, I get the following error:
image

It looks like it’s unable to find the files when they are in two separate rotations. When I pilot it from Pavlovia using a single input file, it runs fine. I can’t see the reason why it would have a problem fetching separate files when run online if it doesn’t when run locally.

4

Hello Hejlo,

the file rot2.xlsx is uploaded?

Best wishes Jens

5

Hi Jens,

Sorry, uploaded where? On gitlab.pavlovia.org I have both rot1.xlsx and rot2.xlsx, as well as the single input file (that runs smoothly online).

6

Hello Hejlo,

do you mind sharing your script and your input files, either via link to your public project or upload *.psyexp, *. xlsx here. Currently, your link just goes to gitlab and not to your project.

Best wishes Jens

7

Of course, here the link to the project Olga Solaja / MIT_online · GitLab.
The single input file is mit_stim_online.xlsx
Thank you!

8

Have you added the possible Excel files as resources under Settings – Online?

9

Ok hejlo,

delete the code-element from your trial-routine. Insert a code-element in the instructions-routine. Insert the following code at the Begin-Experiment tab of that code-element


if int(expInfo['participant'])%2 == 0:
    conditionFile = "2"
else:
    conditionFile = "1"

In your trial loop trials enter $"rot"+conditionFile+".xlsx".

The solution posted only works locally but not on-line. No resources, e.g. rot1.xlsx, were downloaded.

Best wishes Jens

10

It works! Thanks a lot, Jens!

11

I didn’t do that, but it worked out with @JensBoelte suggestion below. Thank you!