Help with Randomization of Non-Overlapping Images

Fri Aug 1 21:43:21 UTC 2014

Thanks for your response David. That is what I was afraid of. Eprime 
support said it should work in theory, but seems as though it keeps getting 
stuck when I add in the forth image. I am trying to list all the 
combinations as well, it is just proving to be a huge task, for there are 
an enormous amount of possible combinations.

I was hoping that this would make coding much quicker and truly random.

Tara

On Friday, August 1, 2014 12:54:35 PM UTC-5, Vinson, David: UCL wrote:
>
>  I suspect you didn't get any replies before due the impressively 
> complicated set of OR statements in that loop. I suspect the problem is 
> there somewhere but imagine it world be a nightmare to track it down. My 
> guess is the loop never exits, whether due to an error or impossible 
> constraints.
>
> What if instead you enumerated the possible legal combinations of 
> positions in a nested List and then just sampled one of them per trial?
>
> Good luck,
> David V
>
> ----- Reply message -----
> From: "tamis... at gmail.com <javascript:>" <tamis... at gmail.com <javascript:>
> >
> To: "e-p... at googlegroups.com <javascript:>" <e-p... at googlegroups.com 
> <javascript:>>
> Subject: Help with Randomization of Non-Overlapping Images
> Date: Fri, Aug 1, 2014 6:30 pm
>
>  
>
>  Does anyone have any suggestions on this? I'm stuck on this and eprime 
> support directed me here. 
>
>  Tara
>
> On Monday, July 28, 2014 3:43:33 PM UTC-5, Tara Miskovich wrote: 
>>
>> Hello, 
>>
>>  I am working on having 4 images randomly places within a rectangular 
>> region without overlapping. I wrote the code below, and it appears to be 
>> working with up to Image 3 added, but when I add in the forth image the 
>> program freezes. I am hoping for some guidance with what to try next or how 
>> to get past this. Here is the code I wrote to randomize the x and y 
>> location for each image.
>>
>>  Thanks!
>> Tara
>>
>>  Dim x1 As Integer
>> Dim x2 As Integer
>> Dim x3 As Integer
>> Dim x4 As Integer
>> Dim y1 As Integer
>> Dim y2 As Integer
>> Dim y3 As Integer
>> Dim y4 As Integer
>>
>>  x1 = random(36, 42)
>> y1 = random(38, 60)
>>
>>  Do
>> x2 = random(36, 42)
>> y2 = random(38, 60)
>> x3 = random(36, 42)
>> y3 = random(38, 60)
>> x4 = random(36, 42)
>> y4 = random(38, 60)
>>
>>  
>>  Loop While (x2 = x1 Or x2 = x1 + 1 Or x2 = x1+2 Or x2 = x1 - 1 Or x2 = 
>> x1 - 2 _
>> And y2 = y1 Or y2 = y1 + 1 Or y2 = y1 + 2 Or y2 = y1 + 3 Or y2 = y1 - 1 
>> Or y2 = y1 - 2 Or y2 = y1 - 3)_
>> Or (x3 = x1 Or x3 = x1 + 1 Or x3 = x1+2 Or x3 = x1 - 1 Or x3 = x1 - 2 _
>> And y3 = y1 Or y3 = y1 + 1 Or y3 = y1 + 2 Or y3 = y1 + 3 Or y3 = y1 - 1 
>> Or y3 = y1 - 2 Or y3 = y1 - 3)_
>> Or (x3 = x2 Or x3 = x2 + 1 Or x3 = x2+2 Or x3 = x2 - 1 Or x3 = x2 - 2 _
>> And y3 = y2 Or y3 = y2 + 1 Or y3 = y2 + 2 Or y3 = y2 + 3 Or y3 = y2 - 1 
>> Or y3 = y2 - 2 Or y3 = y2 - 3)_
>> or (x4 = x1 Or x4 = x1 + 1 Or x4 = x1+2 Or x4 = x1 - 1 Or x4 = x1 - 2 _
>> And y4 = y1 Or y4 = y1 + 1 Or y4 = y1 + 2 Or y4 = y1 + 3 Or y4 = y1 - 1 
>> Or y4 = y1 - 2 Or y4 = y1 - 3)_
>> Or (x4 = x2 Or x4 = x2 + 1 Or x4 = x2 + 2 Or x4 = x2 - 1 Or x4 = x2 - 2 _
>> And y4 = y2 Or y4 = y2 + 1 Or y4 = y2 + 2 Or y4 = y2 + 3 Or y4 = y2 - 1 
>> Or y4 = y2 - 2 Or y4 = y2 - 3)_
>> Or (x4 = x3 Or x4 = x3 + 1 Or x4 = x3 + 2 Or x4 = x3 - 1 Or x4 = x3 - 2 _
>> And y4 = y3 Or y4 = y3 + 1 Or y4 = y3 + 2 Or y4 = y3 + 3 Or y4 = y3 - 1 
>> Or y4 = y3 - 2 Or y4 = y3 - 3)
>>
>>  c.SetAttrib "x1", x1
>> c.SetAttrib "x2", x2
>> c.SetAttrib "x3", x3
>> c.SetAttrib "x4", x4
>> c.SetAttrib "y1", y1
>> c.SetAttrib "y2", y2
>> c.SetAttrib "y3", y3
>> c.SetAttrib "y4", y4
>>  
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