Array problem

[David McFarlane]

Stephane,

I suspect that your run-time delay has nothing to 
do with the lack of a hardware key (especially 
since E-Prime does not use the hardware key at 
run-time), and everything to do with the size and 
complexity of your arrays and randomization 
needs.  The method illustrated in PST's 
NoRepeat.es example is non-deterministic, which 
means it does not guarantee a solution in any 
finite time and the search time gets longer as 
the arrays get longer and stimulus lists more 
complex.  You can find this discussed at length 
on the PST Forum at 
http://support.pstnet.com/forum/Topic3166-5-1.aspx 
, 
http://support.pstnet.com/forum/Topic3178-5-1.aspx 
, and http://support.pstnet.com/forum/Topic2186-5-1.aspx .

-- David McFarlane, Professional Faultfinder


At 8/26/2009 10:19 AM Wednesday, you wrote:
>Dear all,
>
>I am trying to programme an emotional stroop experiment, but I am
>facing a problem with the array declared in the inline I think. I have
>downloaded the NoRepeat.es file from the pst website:
>http://support.pstnet.com/forum/Topic324-5-1.aspx
>
>This file presents 4 different lists of words, each with 5 words. The
>inline RandomizeStim makes sure that no words from the same list are
>presented on two consecutive trials.
>
>In the inline, there is this line for the array:
>'Declare an array of 20 slots to hold 5 stim of each of 4 types. Slot
>0 is unused.
>Dim arrStim(20) As Integer
>
>I wanted to present 4 lists, each including 12 words. So, I have
>changed this line to:
>
>'Declare an array of 48 slots to hold 12 stim of each of 4 types. Slot
>0 is unused.
>Dim arrStim(48) As Integer
>
>I have also added the 28 additional levels needed in the TrialList.
>When I do this, my experiment works fine, but it takes about 5 seconds
>for the instructions to appear.
>
>Then, I have tried to present 4 lists, each including 24 words. So, I
>have changed this line to:
>
>'Declare an array of 96 slots to hold 24 stim of each of 4 types. Slot
>0 is unused.
>Dim arrStim(96) As Integer
>
>I have added the 48 additional levels in the TrialList. In that case,
>the experiment does not even start. The screen stays blank….
>
>At the moment, I don’t have the hardware key plugged in, as one of my
>colleagues is using it. Can it be that the problem has nothing to do
>with the array and that this is caused by the absence of the
>hardwarekey?
>
>Any help is much appreciated.
>
>stephane


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