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How to swap two rows of an array?
How to swap two rows of an array?
This recipe helps you swap two rows of an array
Recipe Objective
While handling arrays,we might desire to swap rows for matrix calculation.
So this recipe is a short example on how to swap two rows in an array. Let's get started.
Step 1 - Import the library
import numpy as np
Let's pause and look at these imports. Numpy is generally helpful in data manipulation while working with arrays. It also helps in performing mathematical operation.
Step 2 - Defining random array
a = np.array([[4,3, 1],[5 ,7, 0],[9, 9, 3],[8, 2, 4]])
print(a)
We have a defined a random array.
Step 3 - Swapping and visualizing output
a[[0, 2]] = a[[2, 0]]
print(a)
Simply using row transformation, we have swapped row 2 with row 0. Finally, we have printed the array using print function.
Step 4 - Lets look at our dataset now
Once we run the above code snippet, we will see:
Scroll down the ipython notebook to visualize the output.
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