Algorithms For Dummies

Defining advanced matrix operations

This book takes you through all sorts of interesting matrix operations, but you use 

some of them commonly, which is why they appear in this chapter. When working 

with arrays, you sometimes get data in a shape that doesn’t work with the algo-

rithm. Fortunately, 

numpy

 comes with a special 

reshape

 function that lets you put 

the data into any shape needed. In fact, you can use it to reshape a vector into a 

matrix, as shown in the following code:

changeIt = np.array([1,2,3,4,5,6,7,8])

  

changeIt

array([1, 2, 3, 4, 5, 6, 7, 8])

  

changeIt.reshape(2,4)

array([[1, 2, 3, 4],

       [5, 6, 7, 8]])

  

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CHAPTER 5