[solved] updating variable

andrea

Hi all!

I'm having some troubles in programming an experiment. In particular I'm trying to update a variable after the subject's response.
I've declared my variables at the beginning of the experiment in an inline code:

exp.set('acc_id1', 0)
exp.set('acc_id2', 0)

After the subject's response I've inserted an inline code to update the variables:

err_corr = self.get('correct')
if self.get('id') == '1': # the id refers to different images, to keep track of the accuracy for each images independently
if err_corr == '1'
exp.set('acc_id1', self.get('acc_id1')+1)
else:
exp.set('acc_id1', self.get('acc_id1')+0)
else:
if err_corr == '1'
exp.set('acc_id2', self.get('acc_id2')+1)
else:
exp.set('acc_id2', self.get('acc_id2')+0)

The experiments works but when I look at the results the values of my variables are always 0, as I declared them at the beginning of the experiment.

I've also tried with:

err_corr = self.get('correct')
if self.get('id') == '1': # the id refers to different images, to keep track of the accuracy for each images indipendentely
if err_corr == '1'
acc_id1 = self.get('acc_id1')+1
else:
acc_id1 = self.get('acc_id1')+0
else:
if err_corr == '1'
acc_id2 = self.get('acc_id2')+1
else:
acc_id2 = self.get('acc_id2')+0

but the result doesn't change.
Any suggestions?

Thank you in advance!

Cheers,
Andrea

andrea

I'm sorry for the code format! I try again!

Here it is the code I used to declared the variables:

exp.set('acc_id1', 0)
exp.set('acc_id2', 0)

And this is the code I used to update the variables:

err_corr = self.get('correct')
if self.get('id') == '1':
    if err_corr == '1':
        exp.set('acc_id1', self.get('acc_id1')+1)
    else:
        exp.set('acc_id1', self.get('acc_id1')+0)
else:
    if err_corr == '1':
        exp.set('acc_id2', self.get('acc_id2')+1)
    else: 
        exp.set('acc_id2', self.get('acc_id2')+0)

I've also tried with:

err_corr = self.get('correct')
if self.get('id') == '1':
    if err_corr == '1':
        acc_id1 = self.get('acc_id1')+1
    else: 
        acc_id1 = self.get('acc_id1')+0
else:
    if err_corr == '1':
        acc_id2 = self.get('acc_id2')+1
    else: 
        acc_id2 = self.get('acc_id2')+0

but the result doesn't change....

sebastiaan

Hi Andrea,

The problem is simply that you're comparing an int with a str. For example, Python will evaluate this as False: 1 == '1'. So the solution would simply be to compare err_corr to an int, like so:

if self.get('id') == 1:

Does that make sense? For more information about how OpenSesame deals with variable types, see:

• http://osdoc.cogsci.nl/usage/variables-and-conditional-statements/#smart-variable-typing-and-some-pitfalls

Cheers!
Sebastiaan

andrea

It absolutely makes sense!!
Thank you so much!

Andrea