IndexError: index is out of bounds for axis 0 python numpy -

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i know python thinks there number. have know idea how fix this. advice appreciated. 

import numpy   test = numpy.array([9,1,3,4,8,7,2,5,6,5,-10,12,-15,19,-20,22,-53,45,43,43,23,-65,-23,46,44,67,79,5,-34,32,-56,-3,1,15,22,3])   n = 0 n1 = 3  while n < len(test):     low = numpy.amin(test[n:n1])     close = test[n1]     high = numpy.amax(test[n:n1])     stochastic = float(close-low)/(high-low)*100.00             print stochastic     n1=n1+1     n=n+1

error:

indexerror: index 36 out of bounds axis 0 size 36

your need put stop condition on n1 instead of n:

while n1 < len(test):

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