random positions for letters

[Peter Quain]

Hi Ashraf

You probably have this sorted out by now, but 
after writing about positioning your stimuli 
using the canvas object (and Mich rightly 
pointing out that this might be a difficult 
solution to implement) I thought more about how 
this could be done, and worked out the (...one 
of  the :) algorithm. Anyway i've built a little 
VB utility that computes the x-y coordinates for 
different size native display resolution 
(640*480; 800*600 etc.) for the upper left 
corners of 6 squares (of side 'S') that centre on 
screen centred circumference at 60, 120, ... 360 
degrees of circle with radius 'r'.

Let me know if it would be of any use and will send it along.

You can run it on any computer and copy down the 
coordinates which could then be entered into the 
x / y properties dialogue of each of your slide 
objects, along with width, to situate them in 
clockface at correct degree. But, if you change 
the display resolution of the monitor you are 
going to be testing on to the resolution e-prime 
will use (set in experiment properties, but 
default, i think, at 640*480) and run the utility 
on that you can then adjust the size of the 
stimulus display very quickly, while measuring 
the elements in terms of the calculations you 
have done for visual angle relative to viewing 
distance. Then you'll get the correct coordinates to proceed.

~Peter


At 06:54 PM 7/08/2009, you wrote:

>Hi Ashraf,
>         I believe at least two members of this 
> list have given you helpful suggestions about 
> what you write below. The question, however, is 
> what exactly is your problem about it? At the 
> moment, it sounds a bit like you want someone 
> else to programme the task for you, or that you 
> hope someone else already has programmed such a 
> task and is willing to share. If that is the 
> case, please spell that out, because as it is, 
> I might as well write a letter to the 
> GetBigBucks googlegroup list saying 'I want a 
> thousand bucks on my account tomorrow' - sure I do, but, so what?
>         If you know the very basics of E-Prime, 
> it can't be too difficult to programme a task 
> in which you use a SlideDisplay, add 6 
> textdisplays to that, all in a circle, write 
> [L1] in the first ... [L6] in the last, use a 
> list with 6 added attributes (L1 to L6), and 
> just fill one of them, for every line, with the 
> specific letter in the specific position (say, 
> 6 positions x 26 letters is 156 cases, or use a 
> nested list with the letters so you merely have 
> 6). And so on. However, where exactly are you stuck in all this?
>
>Best,
>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 ashraf
>Sent: 07 August 2009 00:37
>To: E-Prime
>Subject: random positions for letters
>
>
>
>. I want to  make a circle of  six letters, (L1,L2,L3....TL.) and I want
>to present target letter appears in one of
>six possible positions in the  circle  . also the positions of other
>letters is random
>thanks
>
>
>
>
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