Numpy Flashcards

1
Q

Creating Arrays

A

> > > a = np.array([1,2,3])
b = np.array([(1.5,2,3), (4,5,6)], dtype = float)
c = np.array([[(1.5,2,3), (4,5,6)],[(3,2,1), (4,5,6)]], dtype = float)

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2
Q

Create an array of zeros

A

> > > np.zeros((3,4))

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3
Q

Create an array of ones

A

> > > np.ones((2,3,4),dtype=np.int

16)

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4
Q

Create an array of evenly spaced values

step value

A

> > > d = np.arange(10,25,5)

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5
Q
#Array dimensions
#Length of array
 #Number of array dimensions
#Number of array elements
 #Data type of array elements
 #Name of data type
#Convert an array to a different type
A
>>> a.shape
>>> len(a)
>>> b.ndim
>>> e.size
>>> b.dtype
>>> b.dtype.name
>>> b.astype(int)
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