Comparing multiple list of coordinates points

[Paul Williams]

Hi Alejandro,
An idea may be to try the following,  For example if  the coordinate 
(118,95) is to be compared with (x,y) from your base list the score of its 
accuracy could be 

  [( 118 - x)^2  + (95-y)^2]^1/2  ( pythagoras)

this would give a single number of closeness for each coordinate, you could 
then average these over different fractions of the graph, for example the 
average of the first 10 points then the next ten and so on.

Regards

Paul.


> Hi all,
> 
> How could i compare multiple lists of coordinates
> points against a set of base coordinates points, 
> and determine which of these lists is closer to 
> my base set?
> 
> My base list of coordinate points contains:
> 127,67/127,71/127,76/128,80/128,83/128,86/128,89/128,91
> /127,93/127,94/126,96/126,97/125,97/124,97/123,98/122,97/
> 121,97/120,97/119,96/118,95/117,94/116,93/114,92/113,90/
> 112,89/110,88/109,86/107,85/106,83/105,82/103,81/102,79/
> 100,78/99,77/98,76/96,76/95,75/94,75/93,75/92,75/90,75/
> 89,76/88,77/88,78/87,79/86,81/85,83/85,86/84,89/84,93/84,97
> 
> Then, i have multiple lists (100 or 200 lists) 
> of coordinate points that presents small or big 
> variations in their coordinates position,
> when compared with the base list of coordinate points,
> 
> but all lists have the same first and last points.
> (These first and last points are the line startpoint
> and endpoint respectively.)
> 
> For example, some lists of coordinates points coincide
> exactly or closely with the base list, but only in 
> the first 10 or 12 coordinates points. In other lists,
> the last 20 coordinates almost coincide with the
> last 20 points of base list. In some lists, the middle
> coordinates points coincide almost exactly with 
> my base list of points.
> 
> i was thinking of assigning some kind of score to 
> every coordinate point in every list, then adding 
> these scores to have an overall score for every
> list, then, lists with smaller score would be closer 
> to my base list...
> 
> Im sure that this is not the fastest or better method,
> so my question is:
> 
> Which methods could be devised to know which of 
> these lists approximates more, as a whole, 
> to my base list of coordinates points?
> 
> Thanks in advance,
> 
> alejandro
> 
> Visit my site:
> http://www.geocities.com/capellan2000/
> 
> 
>  
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