Repeated trials in OSWeb

Comments

• sebastiaan

  November 2022

  Hi @ethanweed ,

  That's very strange indeed, thanks for pointing this out. I'm going to look into it!

  — Sebastiaan

  
  
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• sebastiaan

  November 2022

  @ethanweed This behavior results from the custom Array.prototype.random() function in the counter_balance script. I don' fully understand how this results in the behavior that it results in, but it certainly has unintended side effects. You can avoid this by simply using the built-in random.pick() function. See also:

  • https://osdoc.cogsci.nl/3.3/manual/javascript/about/#random-ext-advanced-randomization

  
  
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• ethanweed

  November 2022

  Thanks for the quick response @sebastiaan !

  I tried with

  var list = [1,2,3]
  vars.block_picker = random.pick(list);
  

  but that gets me the error message:

  File "/Applications/OpenSesame.app/Contents/Resources/lib/python3.7/site-packages/libopensesame/inline_script.py", line 116, in run
  
    self.workspace._exec(self.crun)
  
   File "/Applications/OpenSesame.app/Contents/Resources/share/opensesame_plugins/inline_javascript/inline_javascript.py", line 59, in _exec
  
    exec(compiled, self._context)
  
   File "<EvalJS snippet>", line 3, in <module>
  
   File "/Applications/OpenSesame.app/Contents/Resources/lib/python3.7/site-packages/js2py/base.py", line 1158, in get
  
    raise MakeError('ReferenceError', '%s is not defined' % prop)
  
  js2py.internals.simplex.JsException: ReferenceError: random is not defined
  
  
  

  when I run in the OpenSesame app. But I guess that is because `random.picker()` only works when the experiment is run in the browser? I'm guessing js2py can't convert random back to python, maybe? Anyway, it seems to work in the browser now, and that's what I need!

  /Ethan
• sebastiaan

  November 2022

  I'm guessing js2py can't convert random back to python, maybe?

  Yes, that's correct! See also:

  • https://osdoc.cogsci.nl/3.3/manual/javascript/about/#available-javascript-libraries

  
  
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