# pls help me with this prog

Sun Oct 21 10:09:44 CEST 2012

```On Friday, October 19, 2012 4:40:42 PM UTC+8, inshu chauhan wrote:
> in this prog I have written a code to calculate teh centre of a given 3D data..
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> but i want to calculate it for every 3 points not the whole data, but
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> instead of giving me centre for every 3 data the prog is printing the
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> centre 3 times...
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> import cv
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> from math import floor, sqrt, ceil
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> from numpy import array, dot, subtract, add, linalg as lin
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> def CalcCentre(data):
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>     centre = array([0,0,0])
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>     count = 0
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>     n = 0
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>     for p in data[n:n+3]:
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>         count += 1
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>         centre = dot(1./count, centre)
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>         return centre
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>     n += 1
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>     f = open(filename)
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>     result = []
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>     for l in f:
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>         sp = l.split()
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>         t = tuple(map(float, sp[1:4]))
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>         result.append(t)
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>     return result
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> def main (data):
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>     j = 0
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>     for  i in data[:3]:
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>         while j != 3:
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>          centre = CalcCentre(data)
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>          j += 1
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>          print centre
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> if __name__ == '__main__':
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> main(data)
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> PLS HELP ;;;;

# assume data is a list of 3 n numbers, n!=0

n3=data.length()
n=n/3
x=sum(data[0:n3:3])/n
y=sum(data[1:n3:3])/n
z=sum(data[2:n3:3])/n #(x,y,z)

```