defining valid combinations

[Victor]

Hi Matt

Thanks for the response.

I have completed the first part of the experiement but am all at sea
with regards to the second.  I have referred to the help section of E-
studio but to no avail.  I am unsure as to whether i should be setting
up a dynamic or fixed array, nor how to fill it with responses input
by participants.  I have had many attempts and feel sure i am nowhere
near to a solution   :S

Could you please provide further asisstance with regard to creating an
array to select the 5th distinct valid combination as the correct
response?

Thanks again for your time and patience

Regards

Tim

Matt Lenhart wrote:
> Hi Tim,
>
> In general, your responses from the subject will follow the format of
> XXXX{ENTER} where the X's represent the numbers 1-4. At this point,
> there are two ways to determine if a valid response has been made. You
> can either parse through the response and check for repeated numbers,
> or you can compare the entire response to a list of valid responses.
> In cases where there are a very large number of responses, I would
> recommend the former. However, since you have only 24 valid responses,
> I would strongly recommend the latter, since it requires far less
> script, and the script it does require is far less complex.
>
> To start, you would need to create a global array that will hold the
> 24 valid responses. Global variables are those that are declared on
> the User tab of the Script window and retain their value throughout
> the course of the experiment. They can also be accessed from any level
> within the experiment. First, open the Script window via the View menu
> in E-Studio, or by pressing ALT+5. Then, click the User tab. You can
> declare your array as follows:
>
> Dim arrValid(24) As String
>
> This array is now ready for use within your experiment. Place an
> InLine at the start of the SessionProc and load each valid response
> into the array. To make things easier, include the {ENTER} special key
> in the valid response. For example:
>
> arrValid(1) = "1234{ENTER}"
> arrValid(2) = "1324{ENTER}"
> ...
>
> And so on. Then, you would place an InLine immediately following the
> object that collects the subjects response to check the validity. This
> would consist of using a loop to check the response against each value
> in the array. If a match is found, you could set a flag variable and
> exit the loop:
>
> Dim boolMatch As Boolean
> boolMatch = False
>
> Dim nCount As Integer
>
> For nCount = 1 To UBound(arrValid)
>  If Stimulus.RESP = arrValid(nCount) Then
>   boolMatch = True
>   Exit For
>  End If
> Next
>
> This script assumes that the object collecting the response is named
> Stimulus. After this loop has ended, you can then check the value of
> boolMatch to see if a match has been made, and then take the necessary
> action. If the response is not valid, you can jump back to the
> response object using a Label (e.g., place a Label object immediately
> before the response object, and then use a Goto command in your script
> to jump to the name of the Label - Goto Label1, etc).
>
> For the second part of your question, you would need to add a bit more
> script that uses the script you have already created to make
> decisions. If I understand your description correctly, the correct
> response would be defined as the 5th distinct response entered by the
> subject, regardless of what it is. If this is the case, then you will
> need to use another array to store the valid responses that have
> already been made. Now, you will not only be checking the subject's
> responses against the list of valid responses, but also against the
> list of responses that have already been made. Both of these
> conditions would need to be met in order to add it to the list of
> valid responses that have been made. You can then jump back to the
> response object if necessary until you have 5 valid responses. Once 5
> valid responses have been made (i.e., the second array of 5 slots you
> have created is full - that is, none of the slots have "" as their
> value), the correct response has been entered (i.e., the value of the
> 5th slot in the array). You can then use this response on subsequent
> trials as necessary.
>
> If you need more information about the script necessary to do this, I
> would recommend taking a look at the Array topic in the E-Basic Help
> (accessed via the Help menu in E-Studio). You may also want to look at
> the For...Next topic.
>
> Please let me know if you have any quesitons.
>
>
> -Matt
> PST Technical Consultant
> http://www.pstnet.com/
>
> On Aug 27, 8:09�am, Victor <t1m... at yahoo.co.uk> wrote:
> > Hi
> >
> > I am relatively new to eprime and trying to build an experiment where
> > people are asked to try and find the correct combination to a lock.
> > Participants are asked to input 4 numbers (1-4) and then press enter.
> > Each number can only be used once in each entry, so there are 24
> > possible valid responses. The correct combination will be defined as
> > the 5th distinct response that is entered and subsequently rewarded
> > each time it is input over approx 100 trials.
> >
> > What i would like to know is how to define valid responses and return
> > an error message if an invalid response is input?
> > I would also like to know how to record correct responses based on the
> > 5th distinct response input by the participant?
> >
> > Any help will be greatly appreciated.
> >
> > Many thanks
> >
> > Tim
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