When i use .mean in python, it calculates the mean of the all rows.
What if I want to calculate the mean excluding the first few rows of the data ?
1 Answers
What I am able to understand from your question is that you have a 2d numpy array and want to calculate the mean of the rows except the first few.
You can use list slicing and reassign it to some other variable
b = a[n:]
Where new list if from nth element till last, including n.
Example:
import numpy as np
a = np.array([[1, 2], [3, 4]])
b = a[1:]
print(a.mean(), b.mean())
Output:
2.5 3.5
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