====== Utilanalz::smooth Function ======
list smooth(list x_y, int threshold=5, int poolN=10)
===== Description =====
A simple filter filter a list consists of list(like [0, 1] for x=0, y=1), takes the noises off.
===== Paramters =====
  - x_y list of lists, x_y is a list like [[0, 0],[1, 1],]
  - threshold int, for threshold value, if the abs(value, other_value) more than threshold, the value may be a noise
  - poolN int,  how long  the polling poll is. For poolN=10, the function would look forward 10 items, back 10 items, than the items poll according to the parameter threshold. If the agreement more than a half, this point is not a noise.

===== Return =====
  - a list that will return a smoothed list of data.
===== Detail Information =====
<code>

a = 
[      

[6, 6],
[7, 7],
[8, 8],
[9, 9],
[10, 100],
[11, 11],
[12, 12],
[13, 13],
] 

smooth(a, int threshold=5, int poolN=3) 
will return
[      
[6, 6],
[7, 7],
[8, 8],
[9, 9],
[11, 11],
[12, 12],
[13, 13],
]  

</code>

===== Changelog =====
newly built, 2012-01-21