Randomizing image position in a slide object

[David McFarlane]

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
> 
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>  
> 
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> 
> Michiel Spapé
> 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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