[solved] Calling and logging of variables by identical items within different loops
Hello together, I´m not sure if I understand the way OpenSesame calls (A) and logs (B) variables when using identical items within different loops.
INLINESCRIPT-Item: represents (together with a logger-Item) my TrialSequence; by using 'exp.get('numberOfSquares') I call a parameter that I typed in for each cycle/trial (of that block) in the table within my LOOP-Item.
This INLINESCRIPT is appended to two loops that contain the identical variables ('numberOfSquares' and others), but different values. So the two loops represent different blocks with different values for the same parameters, and both loops contain the identical InlineScript.
When my InlineScript is called by my second loop, can I be sure that the 'exp.get'-Command also accesses the values of the variable 'numberOfSquares' from the second loop - its parent item - and not from the first loop? What´s the difference to the 'self.get'-Command?
My experiment works runs without error, but I´m in doubt because the following observation - my second (probably related) problem:
My trialsequence consists not only of the above mentioned InlinceScript but also of a logger-Item. So I use the identical InlineScript and logger-Item within two different loops.
When I click on the logger-Item within my second loop I can only select to log the 'numberOfSquares'-Variable in the list that belongs to the first loop (so called source item).
I mean on the one hand it´s obvious that my selection within the one loop will be my selection within the other loop, because the logger-Item is identical. BUT: Why is only shown that version of the 'numberOfSquares'-Variable which corresponds to the table of the first loop, but not that version with my second loop as its parent item?
I would like to keep my trialsequence (InlineScript + logger-Item) as a re-useable object which I can append to different loops (with the same variables, but different values), taking the values from the respective parent item...
Welcome to the forum!
I'm assuming that your experimental overview looks something like this:
is that right?
Variables can exist on two levels: in an item (local) or in the experiment (global). The function
exp.get()only looks for the desired variable at the highest (global, experimental, level), whereas
self.get()looks first at the item level and then at the experiment level. In most situations this boils down to the same thing (like in your experiment, since a loop item, where you declared your variable, saves variables at the experimental level). Still, I would advise you to always use
self.get(). For more information, please see:
As said above, I would advise you to use
self.get(), but yes, you can be sure about that! For more information about the order in which items in OpenSesame are run, see this article:
You're right, the 'source item(s)' column is not always complete. Thanks for pointing this out! We marked it as an issue.
Yet, the important point is that under the hood everything works as desired: A variable, once defined, is logged appropriately.
Three easy ways to verify things like this yourself while programming your experiment:
1.) Use print statements in your inline_script item (which will appear in the debug window):
2.) Temporarily append a feedback item to your trial sequence, where you use the square-bracket method to display the trial variables:
Finally, with regard to question B, you can verify in your output file whether everything went fine:
I hope this helps!
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thank you for your extensive reply to my questions! I find out that my experiments works well, but now when I read your post I more convinced ;-)
That issue with not showing the correct source item in the logging list confused me - thanks that it will be considered.
Good to hear that your experiment works!
Let us know if you have any more questions!
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