in this prog I have written a code to calculate teh centre of a given 3D data..
but i want to calculate it for every 3 points not the whole data, but instead of giving me centre for every 3 data the prog is printing the centre 3 times... import cv from math import floor, sqrt, ceil from numpy import array, dot, subtract, add, linalg as lin def CalcCentre(data): centre = array([0,0,0]) count = 0 n = 0 for p in data[n:n+3]: centre = add(centre, array(p[:3])) count += 1 centre = dot(1./count, centre) return centre n += 1 def ReadPointCloud(filename): f = open(filename) result = [] for l in f: sp = l.split() t = tuple(map(float, sp[1:4])) result.append(t) return result def main (data): j = 0 for i in data[:3]: while j != 3: centre = CalcCentre(data) j += 1 print centre if __name__ == '__main__': data = ReadPointCloud(r'Z:\data\NEHreflectance_Scanner 1_part.txt') main(data) PLS HELP ;;;; -- http://mail.python.org/mailman/listinfo/python-list