Randomizing image position in a slide object

[gilis]

I meant PTB and not PST...as I told, very "green" in here..;)

On 22 פברואר, 19:19, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
wrote:
> Hi Gilis,
> Yes, I noticed it sounded very matlabby :) Matlab is awesome in terms of arrays, but I'm happy enough that E-Prime at least has this randomiseArray, er randomizeArray, function. Here's how you can do about the same:
> Dim locs() as integer
> Dim I as integer
>
> For i = 1 to 640
>         Locs(i) = i
> Next i
>
> RandomizeArray Locs     'this would be Locs = RandomizeArray(Locs) in Matlab style
>
> ...or something of that sort to obtain 640 values which you can later insert in your trial (e.g. if a slide has an image with x value referencing [myX] and you have a trial-counter called trialnum, then something like c.SetAttrib "myX", Locs(trialnum)
>
> Personally, I get heavily frustrated by the usage of (E-)Basic ()s which seems rather arbitrary, their lack of []s to reference arrays as in C, and can't quite wrap my mind around how all that is yet different in Matlab (including the added {}s)!
>
> 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 16:50
> To: E-Prime
> Subject: Re: Randomizing image position in a slide object
>
> Hi Mich,
>
> Sure it make a little sense, it was just an hypothetical example ;) -
> meaning that I was trying to find a way to randomize three dichotomic
> values (e.g., a , c and d without the sequence between them).
> Somehow   "RandomizeArray"  was associatively connected in my mind
> with similar suffix functions from Matlab -I was sure it can be done
> in Eprime as well...For the present experiment I will use the list,
> but anyway wanted to know the alternatives. Thank you very much for
> the link, I hope to use it  intensively.
> Cheers
> Gilis
>
> On 22 פברואר, 18:13, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
> 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 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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