Weighted Random Number

[Roger Guay]

Hi Walt,

This works perfectly! I'll add it to the other methods I've received for evaluation.

Thanks and cheers,
Roger


On Mar 4, 2013, at 10:06 AM, "Sumner, Walt" <WSUMNER at dom.wustl.edu> wrote:

> This seems to work:
> 
> Make a stack with a button having this script, then click the button. It will bounce around in a normal distribution in H and V coordinates.
> 
> 
> on mouseUp
> 
>   local tSD,tMean,tPoint,tStartPoint
> 
>   put the loc of me into tStartPoint
> 
>   put the width of this window div 6 & comma &  the height of this window div 6 into tSD
> 
>   put the width of this window div 2 & comma &  the height of this window div 2 into tMean
> 
>   put BoxMullerDist(tMean,tSD) into tPoint
> 
>   set the loc of me to tPoint
> 
>   wait 1 second
> 
>   set the loc of me to tStartPoint
> 
> end mouseUp
> 
> 
> function BoxMullerDist pMean,pStdDev
> 
>   local tU,tV,tX,tY
> 
>   put random(100)/100 into tU
> 
>   put random(100)/100 into tV
> 
>   put sqrt(-2*ln(tU))*cos(2*pi*tV) into tX
> 
>   put sqrt(-2*ln(tU))*sin(2*pi*tV) into tY
> 
>   return item 1 of pMean + tX*item 1 of pStdDev & comma & item 2 of pMean + tY*item 2 of pStdDev
> 
> end BoxMullerDist
> 
> You can tweak the range by setting tSD to div 4 to hit the edges more often. You can tweak the center point by shifting the mean, but you will go off the edges sometimes if you shift too far.
> 
> Ref: http://en.wikipedia.org/wiki/Normal_distribution#Generating_values_from_normal_distribution
> 
> Walt Sumner
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