How to add column to np array

x1= data[:,:-1]
x = np.insert(x1, index(0), values=1, axis=1)
#to add a column of 1's in the features matrix

Add a new column to numpy array

import numpy as np
N = 10
a = np.random.rand(N,N)
b = np.zeros((N,N+1))
b[:,:-1] = a

Source: stackoverflow.com

Add column to existing numpy array

b = np.insert(a, insert_index, values=a[:,2], axis=1)

Source: stackoverflow.com

Add column array python

>>> a = np.array([[1,2,3],[2,3,4]])
>>> a
array([[1, 2, 3],
       [2, 3, 4]])

>>> z = np.zeros((2,1), dtype=int64)
>>> z
array([[0],
       [0]])

>>> np.append(a, z, axis=1)
array([[1, 2, 3, 0],
       [2, 3, 4, 0]])

Similar codes

4 votes113 views1 answer
Replace empty string and "records with only spaces" with npnan pandas
Python
9 votes204 views2 answers
Flask flash
Python Flask
15 votes106 views3 answers
Remove punctuation python string library
Python
0 vote156 views1 answer
Get value of 1 field in model django
Python Django
0 vote130 views1 answer
Python stop the whole function
Python
17 votes129 views2 answers
Python calculate factorial
Python
92 votes82 views3 answers
Python self
Python
1 vote128 views1 answer
Python get index of first element of list that matches condition
Python
0 vote123 views1 answer
Numpy combine two arrays selecting min
Python
0 vote123 views1 answer
Load dataset from seaborn
Python