[solved] Randomize and take only one of three conditions

Comments

• eduard

  January 2016 edited 12:00PM

  Hi,

  I think, a single loop that iterates over the words will be enough for your purposes.
  In this loop, add each of the words on a line. This makes sure that you will see each word only once (unless you repeat the entire list multiple times). In order to make the position were the word is presented counterbalanced, you need to do some inline_scripting. Add one inline_script before the word-loop. Inside this inline_script, you will create a list will all possible locations and how often they appear, like so:

  import random
  positions = [-350,0,350]*10
  random.shuffle(positions)
  

  Next, you have to place another inline_script in the sequence, which the word loop is iterating over (so the one, in which you are also going to present the words).
  In this inline_script, you will draw one position from your list of positions and use it to define, where the word will be drawn to.

  # takes the first value in that list without replacement
  position = positions(0)
  

  After that you can draw your stimuli, either with a sketchpad, or you can draw directly from within this same inline_script:

  # just a small example. Of course you have adapt it to your preferences
  cv = canvas()
  cv.text(var.word, x = position,y=0)
  cv.show()
  self.sleep(1000)
  

  I hope this helped.

  Eduard

  
• Paox

  January 2016 edited 12:00PM

  Thank you a lot Eduard, this looks great

  But I have still one problem: when I run this, there occurs this error:
  "Error while executing inline script
  phase: run
  item: __script2
  line: 2
  exception message: 'list' object is not callable
  exception type: TypeError"

  So in the seconds script (# takes the first value in that list without replacement
  position = positions(0)) this occurs at line 2 =" position = position(0)".

  I've tried to set the list "positions" global. But this dont solve the problem. I dont get it

  
• eduard

  January 2016 edited 12:00PM

  Hi,

  My bet, I forgot something in the code.

  Instead of position = positions(0) it should have been position = positions.pop(0)

  Sorry for that.

  eduard

  
• Paox

  January 2016 edited 12:00PM

  Ok, it works Thanks

  Still one question:

  If I use the canvas instead of the sketchpad, it shows me this error:
  "item: __script2
  line: 4 exception message: name 'canvas' is not defined
  exception type: NameErroras()"

  But canvas is a function...

  But if I use the sketchpad instead of the canvas-inline code, it tells me, there is no variable "position".

  Sorry for the questions again, I'm really a newbie.

  Thank you
• eduard

  January 2016 edited 12:00PM

  Which version of OpenSesame do you use?

  Assuming that you use OpenSesame 3.0.x
  For the sketchpad use you have to make position a variable of the experiment. This works simply by storing it as var.position = positions.pop(0). Then later in the sketchpad, you set the position you want to draw as [position].

  If you use Opensesame 2.9.x, things are a bit different. Let me know if this is the case, and I will explain what you could do.

  Eduard

  
• Paox

  January 2016 edited 12:00PM

  Ok, I used "exp.set("position", position)" and it works.

  Thank you a lot Eduard. Outstanding support.
• eduard

  January 2016 edited 12:00PM

  Ah ok. Then 2.9 it was.

  You're welcome.