python get a vector of row sums from an array
# Basic syntax:
np.sum(your_array, axis=1).tolist()
# Where axis=1 sums across rows and axis=0 sums across columns
# Example usage:
import numpy as np
your_array = np.array([range(0,4),range(3,7),range(1,5),range(2,6)])
print(your_array)
--> [[0 1 2 3]
[3 4 5 6]
[1 2 3 4]
[2 3 4 5]]
np.sum(your_array, axis=0).tolist() # Return column sums
--> [6, 10, 14, 18]
np.sum(your_array, axis=1).tolist() # Return row sums
--> [6, 18, 10, 14]python how to sum columns of an array
# Example usage 1:
import numpy as np
numpy_array = np.array([[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5]])
np.sum(numpy_array, axis=0)
--> array([ 3, 6, 9, 12, 15])
# Example usage 2 (without numpy):
array = [[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5]]
[sum(x) for x in zip(*array)]
--> [3, 6, 9, 12, 15]Copyright © 2021 Codeinu
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