/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

29 votes182 views4 answers
Mean of a column pandas
Python
0 vote194 views1 answer
Doormat pattern
Python
0 vote182 views1 answer
How to invert a true false array in python
Python
0 vote188 views1 answer
Random night stars with python turtle
Python
5 votes215 views1 answer
Display np array as image
Python
0 vote269 views1 answer
Pip install scrapy-proxy-pool
Python
4 votes191 views1 answer
How to increase text size tkinter
Python
8 votes176 views3 answers
Pip install safely in jupyter
Python
0 vote216 views1 answer
How to save the command result with ! in python
Python
2 votes192 views1 answer
Urlpatterns += static(r'^static/(?P<path>.*)$', 'django.views.static.serve', {'document_root': settings.STATIC_ROOT})
Python