[solved] Setting the number of cycles in a loop programatically

Comments

• nsriram

  June 2014 edited June 2014

  Ok I am using the approach suggested in an older forum post which is just about deleting the loop object and using an inline script to loop in the run tab. When I do this and set the global variable just before the prepare and run for trial sequence, it doesn't seem to recognize the variable inside the sketchpad. Wonder if this is related to scope.

  Here is what I am trying to do

  All variables starting with g have been defined as globals at start of experiment

  contents of RUN tab in the loop in-line script

  for i in range(gblocksize):
          gtrialnumber = i 
          gtrialstimulus = gitems[gitemsorder[gtrialnumber]]
          gtrialresponse = gitemsresponse[gitemsorder[gtrialnumber]]
          exp.items["trialsequence"].prepare()
          exp.items["trialsequence"].run()
  

  Problem is that the sketchpad inside the trialsequence does not recognize [gtrialstimulus] even though values are correctly set inside the loop (can check with print statement). Now earlier I had similar code running in a script inside the trialsequence and that worked. Why should this matter as the g variables are all previously defined as global.

  If I define the gtrialstimulus outside the loop to a fixed value, then the sketchpad seems to recognize it (say in a different inline script that is outside the trialsequence as well).

  So I guess my question is: How can I set the values within the loop so that it correctly changes the global variable gtrialstimulus and is recognized in the sketchpad (as it was doing previously when the code was inside the trialsequence itself.
• nsriram

  June 2014 edited 6:32PM

  I do find that the g variables being changed in an inline script inside the trialsequence object are recognized. One other oddity. Inside this loop, the count_trialsequence seems to start from 1, not 0. Is this documented behavior that we can rely on?
• nsriram

  June 2014 edited June 2014

  Now its started from zero but it loops the trial n+1 instead of n

  for i in range(8):
          exp.items["trialsequence"].prepare()
          exp.items["trialsequence"].run()
  

  This shows 9 trials, instead of 8. Puzzled. The count_trialsequence does start from zero.
• nsriram

  June 2014 edited June 2014

  I've put a print statement that counts the number of trials. It goes from 0 to 8 for some weird reason, instead of 0 to 7. Any ideas?
• nsriram

  June 2014 edited June 2014

  Above issue likely due to not turning off the trial sequence using "never". Problem with counter continues (it starts at 1 instead of 0).
• nsriram

  June 2014 edited 6:32PM

  https://www.dropbox.com/s/krjy4vs2desdm73/counttrialsequence.opensesame.tar.gz

  shows this counting from 1 instead of zero. Is this normal?
• nsriram

  June 2014 edited 6:32PM

  I think this file gets at what I was looking for.. A custom counter that does start from zero. One thing I learned was to use to exp.set and exp.get for simple numeric or string variables. For arrays/objects, the only option is perhaps using the global definition.

  https://www.dropbox.com/s/utk8itsbaootdv4/customcounter.opensesame.tar.gz
• nsriram

  June 2014 edited 6:32PM

  The basic issue is resolved in this thread
  http://forum.cogsci.nl/index.php?p=/discussion/1021/possible-to-populate-sketchpad-in-sequence-using-array#Item_2
• sebastiaan

  June 2014 edited 6:32PM

  Wow, you've been busy! To make life easier for people reading (and possibly answer) your question, could you let us know whether you've been able to resolve this issue, and if not, where you are exactly?

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• nsriram

  June 2014 edited June 2014

  Yes, this got resolved. See the lessons learnt post for a generic description.