in np.array how to multiply with one coloumng code example
Example: 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])