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[solved] logging multiple sessions

edited January 2014 in OpenSesame

Hello!
I am running an experiment where each subject undergoes several sessions of the same procedure. I would like OpenSesame to progressively number each session of any give subject, i.e. when the operatore inserts the subject's number, the program should automatically look for the last session done by that subject and number the new session accordingly. Also, the log should be automatically given as filename the "subject+session number". Is this possible? What would be the easiest way to do it?
Thank you very much,
Paolo

Comments

  • edited 12:47AM

    Hi Paolo,

    You can achieve this by closing the default logfile at the start of the experiment, providing a new name, and reopening the logfile. Of course, to determine the new name for the logfile, you need to use some logic to see which session-number logfile does not yet exist for that particular subject number.

    It's a bit tricky, and requires some inline scripting. But the script below should get you started:

    import os
    # Close the current logfile
    exp._log.close()
    # Check for each session number whether a file called
    # `[subject nr]-[session nr].csv` already exists, and pick the first session
    # number which does *not* exist.
    for session_nr in range(0, 1000):
        path = '%d-%d.csv' % (self.get('subject_nr'), session_nr)
        if not os.path.exists(path):
            break
    print 'Using %s' % path
    exp.logfile = path
    # Reopen the logfile
    exp._log = None
    exp.init_log()
    

    Cheers,
    Sebastiaan

    Buy Me A Coffee

  • edited 12:47AM

    excellent - thank you so much! the script does exactly what I want. The one thing it does not do, however, is to log the session_nr ... should I declare the variable somewhere for it to be logged?
    thanks - Paolo

  • edited 12:47AM

    Hi,

    should I declare the variable somewhere for it to be logged

    Yes! In order to make in-an-inline-script-defined variables available in the GUI (e.g. the logger item) as well, you should set them at the end of you inline script by using the exp.set() function. For example:

    exp.set("session_nr", session_nr)
    

    For more information, see:

    Does that help?

    Best,

    Lotje

    Did you like my answer? Feel free to Buy Me A Coffee :)

  • edited 12:47AM

    awesome thank you!

  • edited 12:47AM

    Hi there,

    I'm new to OpenSesame and Python - I tried using the above script to automatically set the session number, which is then saved as the file name. I tried entering it into the main script and it was removed once I clicked apply, and when I put it in a python inline script at the start of my experiment in the GUI, it didn't run. Am I missing something simple?

    Ideally, I would like to use this with opensesamerun. Would that be possible?

    Many thanks,
    Joff

  • edited 12:47AM

    and when I put it in a python inline script at the start of my experiment in the GUI, it didn't run. Am I missing something simple?

    Yes, you (or rather we) are missing the actual error message that you get when the experiment doesn't run!

    Buy Me A Coffee

  • edited 12:47AM

    Hi Sebastian,

    Thanks for getting back to me. There was no error message, the experiment runs but it is as if the inline code is ignored.

    Thanks,
    Joff

  • edited 12:47AM

    Hi there,

    I am trying to use this script with OS 3, but I receive the error " 'str' object has no attribute 'var' ". I think the problem is with the initiate logfile function. Any help would be greatly appreciated!

    import os
    
    # Close the current logfile
    log.close()
    
    # Check for each session number whether a file called
    # `[subject nr]-[session nr].csv` already exists, and pick the first session
    # number which does *not* exist.
    var.session_nr='session_nr'
    for session_nr in range(0, 1000):
        path = '%d-%d.csv' % (var.subject_nr, session_nr)
        if not os.path.exists(path):
            break
    print('Using %s' % path)
    
    # Initiate new log file and open
    log.__init__('practice_experiment.osexp', path)
    log.open(path)
    

    Many thanks,
    Joff

  • edited 12:47AM

    Hi Joff,

    You don't need to call log.__init__(). Essentially, in Python you never (or very rarely) call _init__() functions. Those are constructors that are called automatically when an object is created, and OpenSesame has already created log for you. So in this case, simply calling log.open() will be enough to close the current logfile, and open a new one.

    Cheers!
    Sebastiaan

    Buy Me A Coffee

  • edited 12:47AM

    Great, that's working now. Thanks very much!

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