Randomization and constraints between column

Saiph

Hi to all,

I'm programming this experiment in Opensesame and I'm struggling with loop constraints.

I have a loop table like this:

which need to be repeated 5 times in random order. What I would like to do is to avoid the successive presentation of the same pairing, such as yourself-a stranger followed by yourself-a stranger. The ideal thing would be something similar to constrain [variable] mindlist, but that can be applied to the pairing.

I also thought about a different approach: I might change the loop table into this:

set repetition to 10 times (to obtain the same number of trials) and use the shuffle function on the identity_2 . But then I would need to avoid the presentation of trials in which identity_1=identity_2 (like, yourself-yourself pairing) and I couldn't find anything like this in the "looping and independent variables" section.

In the forum, I found a solution which basically rewrite the loop in Python, but the experiment will be implemented online and inline_script are not supported.

Thanks in advance,

Saiph

sebastiaan

Hi Saiph,

If I understand your problem correctly, then you can solve it by adding a third column, say pair , and giving this a unique value for each of the six pairs, say 1 … 6. And then you can use the mindist constraint on this column.

Hope this helps!

Cheers,

Sebastiaan

Saiph

Hi Sebastaan!

Such a simple solution, don't know how I haven't thought about it, it works like a charm.

Thank you!

Saiph