/Python/Python multiply one column of array by a value

Python multiply one column of array by a value

import numpy as np
# Let a be some 2d array; here we just use dummy data 
# to illustrate the method
a = np.ones((10,5))
# Multiply just the 2nd column by 5.2 in-place
a[:,1] *= 5.2

# Now get the cumulative sum of just that column
csum = np.cumsum(a[:,1])

Source: stackoverflow.com

Similar codes

15 votes134 views1 answer
Format to 2 or n decimal places python
Python
3 votes135 views3 answers
Discord.py clear command
Python
31 votes133 views5 answers
How to place image in tkinter
Python
1 vote144 views1 answer
Pd count how many item occurs in another column
Python
0 vote134 views1 answer
Rename duplicates in list python
Python
2 votes138 views3 answers
Binary tree
Python
0 vote140 views1 answer
ImportError: No module named colored
Python
1 vote131 views1 answer
Remove consecutive duplicates python
Python
14 votes143 views6 answers
Value_counts pandas
Python
1 vote122 views1 answer
Add seconds to datetime python
Python