add column to existing numpy array

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HotFlow answered on May 12, 2020 Popularity 10/10 Helpfulness 4/10

answer add column to existing numpy array

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add column to existing numpy array

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

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Source: stackoverflow.com

Tags: add numpy python

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Contributed on Apr 15 2021

HotFlow

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Insert numpy array to column

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new_arr = np.insert(arr, index, arr_to_insert, axis=1)

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Contributed on Feb 10 2022

Johan

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how to add column to np array

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

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Contributed on Feb 04 2022

Abdelrahman Osama

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add column array python

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>>> 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]])

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Contributed on Nov 26 2021

Blue Bee

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numpy add new column

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: import numpy as np
: N = 3
: A = np.eye(N)

: np.c_[ A, np.ones(N) ]              # add a column
array([[ 1.,  0.,  0.,  1.],
       [ 0.,  1.,  0.,  1.],
       [ 0.,  0.,  1.,  1.]])

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Contributed on Dec 02 2021

Obnoxious Ostrich

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numpy add column to 2d array

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# Using numpy's np.hstack( (a,b) )
import numpy as np
a = np.zeros((4,2))
    array([[ 0.,  0.],
           [ 0.,  0.],
           [ 0.,  0.],
           [ 0.,  0.]])

b = np.ones((4,1))
    array([[ 1.],
           [ 1.],
           [ 1.],
           [ 1.]])

np.hstack((a,b))
array([[ 0.,  0.,  1.],
       [ 0.,  0.,  1.],
       [ 0.,  0.,  1.],
       [ 0.,  0.,  1.]])

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Source: stackoverflow.com

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Contributed on Dec 05 2022

Portobello Mushroom

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add a new column to numpy array

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

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Contributed on May 12 2020

Glamorous Grouse

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add column array python

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

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Source: codefantasy.org

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Contributed on Mar 25 2022

Splendid Sheep

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add a new column to numpy array

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Returns
-------
append : ndarray
    A copy of `arr` with `values` appended to `axis`.  Note that `append`
    does not occur in-place: a new array is allocated and filled.  If
    `axis` is None, `out` is a flattened array.

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Source: nullorempty.org

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Contributed on Mar 24 2022

Worried Wasp

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add column to existing numpy array

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add column to existing numpy array

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