In [1]:

    

import numpy as np


    

In [9]:

    

x = np.array([1.,2.,3.])


    

In [10]:

    

x.sum()


    

    
Out[10]:





6.0

In [11]:

    

np.power(x, 2)


    

    
Out[11]:





array([ 1.,  4.,  9.])

In [12]:

    

def squared(i, n):
    return np.power(i, -1 * np.arange(1 , n + 1., 1))


    

In [14]:

    

x1 = squared(2, 3)


    

In [22]:

    

x2 = squared(10, 3)


    

In [23]:

    

x1


    

    
Out[23]:





array([ 0.5  ,  0.25 ,  0.125])

In [24]:

    

x2


    

    
Out[24]:





array([ 0.1  ,  0.01 ,  0.001])

In [25]:

    

def distance (x1, x2):
    y = x2 - x1
    z = np.power(y, 2)
    return np.sqrt(z.sum())


    

In [26]:

    

distance(x1, x2)


    

    
Out[26]:





0.48267587468196504

In [31]:

    

x = np.arange(2, 100, 1)


    

    




---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-31-ecdb8231cf9c> in <module>()
      1 x = np.arange(2, 100, 1)
----> 2 s = dist(2, 100)

NameError: name 'dist' is not defined

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