avoid repeating trial type?

[akiko]

Hello,

I'm new to E-prime and trying to run a visual search experiment.
There are 12 possible locations that Target could appear, each target
location happens 3 times in 1 run. Subjects make an eye movement to
the target location (scored after the experiment). So, there is no
input fro the subjects during the experiment. I'd like to randomize
trials, but target location should not repeat. Trials are listed in a
List object ("trialList"), which has a Procedure called "search".

My most recent effort is to write the following InLine script at the
top of the "search" Procedure, but it doesn't work...

If TrialNum > 1 Then
      If lastTarLoc = c.GetAttrib("tarLocation") Then
                       trialList.Terminate
      End If
End If

where "lastTarloc" is the target location of the previous trial (made
in the end of each trial) and "tarLocation" is the location of the
current trial. I'm guessing I have to use InLine and/or Label to do
this, but I don't know where to put it, and how it should be used.

If anyone knows how to do this, or knows of any example available
online, please let me know.
Thanks in advance!
Akiko
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