Randomizing image position in a slide object

[gilis]

Thanks David,
BTW, just tried to open the link and it seem to be a dead one-can you
post it again please?
Best Wishes
Gilis

On 22 פברואר, 18:35, David McFarlane <mcfar... at msu.edu> wrote:
> Gilis,
>
> As Michiel says, setting out the full set of combinations into a List is
> pretty much the "E-Prime way".  However, if you mean to combinatorically
> mix one set of attributes (e.g., stimulus location) with other
> attributes, then you might look into nested Lists.  In that case, first
> work through the Nested List tutorial in Appendix C of the User's Guide
> that came with E-Prime, and see if that gives you any ideas.  And of
> course, do also look through Michiel's E-Primer.
>
> -- David McFarlane, Professional Faultfinder
>
> Michiel Spape wrote:
> > Hi Gilis,
> > What may be unelegant programming-wise, I often find much better psychologically, for some reason! That is, yes, it seems like an awful lot to tell a programme to use "red", "green", "blue" for a Stroop task and then having to bother with setting all 9 combinations, rather than, for example, setting one attribute (congruence) and using a little script to randomly set colours and words. Still, I would advise you to use the list anyway; it provides much more clarity for yourself and others, its randomising tends to give better results than randomizing with replacement, and, well, you don't need to learn so much E-Basic programming.
>
> > Anyway, we have discussed randomising location fully and thoroughly in the seminal E-Primer (www.cognitology.eu, under references) and the easiest would be just to use percentage. I don't see where 'side' comes in... Just use two attributes [XLoc], [YLoc] if you will, use % values in your list and voila.
>
> > "c.SetAttrib "side", RandomizeArray(1,3,4)"
> > ...makes very little sense. If you are using "Side" to set your location, why do you want to fill it (I guess) with 1, 3 or 4? Are those pixels? 3 is about 2 pixels to the right of 1... Are you trying to randomize a list? If you have many combinations, I suggest looking up nested lists in the user guide / getting started guide.
> > Cheers,
> > Mich
>
> > Michiel Spap
> > Research Fellow
> > Perception & Action group
> > University of Nottingham
> > School of Psychology
>
> > -----Original Message-----
> > From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of gilis
> > Sent: 22 February 2010 14:44
> > To: E-Prime
> > Subject: Randomizing image position in a slide object
>
> > Hi to all again,
>
> > Appologize for bothring the forum again, but it's not a too hard one I
> > hope:
> > I want the computer to randomly present the stimuli in the center,
> > left or right side
> > of the display.
>
> > I know that  it can be done easily by adding attribute ("side") in the
> > trial list with values of left right or center and then to define the
> > X axis of the image in the slide object as [side] and that's all.
>
> > However, this method means that I have to insert manualy all different
> > combinations -and it's not an elegant solution.
>
> > I tried to define side as a new attribute in an inline object this way
>
> > c.SetAttrib "side", RandomizeArray(1,3,4)
>
> > of course-it didn't work and I tried many different configurations and
> > randomization commands. With which command can I randomize left,
> > center and right?
>
> > Thanks,
> > Gilis

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