randomising the nth image in a sequence

[Victor]

Hi Lois,

There may be other ways to do this but I might suggest declaring a
global variable, say Dim imagesequence as integer and then at the
beginning of a list, determine the variable as imagesequence = random
(5,8) in an inline in order to get a random number between 5 and 8.

You can then have another variable, say Dim  trialcount as integer
which increases (trialcount = trailcount + 1) after each stimlus
presentation. Also declare a variable Dim oddimage as string for the
odd image. It is then possible to have an inline before the stimulus
presnetation to say

If imagesequence = trialcount then oddimage = "file.bmp"
c.setattrib "imagevariable", oddimage

This should change the image is changed to the odd one on the
specified trial.

Hope this helps,
Tim

On Jul 14, 11:09 am, Lois <doro... at googlemail.com> wrote:
> Hi, I'd like to display a sequence of 9 images in which only the 5th,
> 6th, 7th, or 8th will be different to the rest of the sequence. This
> sequence will be used in around 72 trials, in which the odd image in
> the 5th, 6th etc. position will be randomised.
>
> Would anyone have a suggestion of the best way to do this please?
>
> Thanks,
> Lois
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com
For more options, visit this group at http://groups.google.com/group/e-prime?hl=en
-~----------~----~----~----~------~----~------~--~---