Change language

Python | Multiply a two-dimensional array corresponding to a 1d array

Method # 1: Using np.newaxis ()

# Python code for demonstration
# multiplying a 2d array
# with a 1d array

 

import numpy as np

 

ini_array1 = np.array ([[ 1 , 2 , 3 ], [ 2 , 4 , 5 ], [ 1 , 2 , 3 ]])

ini_array2 = np.array ([ 0 , 2 , 3 ])

 
# printing initial arrays

print ( "initial array" , str (ini_array1))

 
# Multiplying arrays

result = ini_array1 * ini_array2 [:, np.newaxis]

 
# print result

print ( " New resulting array: " , result)

Exit:

 initial array [[1 2 3] [2 4 5] [1 2 3]] New resulting array: [[0 0 0] [4 8 10 ] [3 6 9]] 

Method # 2: Using the Axis As Not

# Python code for demonstration
# multiplying a 2d array
# with a 1d array

 

import numpy as np

 

ini_array1 = np.array ([[ 1 , 2 , 3 ], [ 2 , 4 , 5 ], [ 1 , 2 , 3 ]])

ini_array2 = np.array ([ 0 , 2 , 3 ])

 
# printing initial arrays

print ( "initial array" , str (ini_array1))

 
# Multiplying arrays

result = ini_array1 * ini_array2 [:, None ]

 
# print result

print ( "New resulting array:" , result)

Exit:

 initial array [[1 2 3] [2 4 5] [1 2 3]] New resulting array: [[0 0 0] [4 8 10] [3 6 9]] 

Spo ex # 3: Using transpose ()

# Python code for demonstration
# multiplying a 2d array
# with a 1d array

 

import numpy as np

 

ini_array1 = np.array ([ [ 1 , 2 , 3 ], [ 2 , 4 , 5 ], [ 1 , 2 , 3 ]])

ini_array2 = np.array ([ 0 , 2 , 3 ])

 
# printing initial arrays

print ( "initial array" , str (ini_array1))

 
# Multiplying arrays

result = (ini_array1.T * ini_array2) .T

 
# print result

print ( "New resulting array:" , result)

Exit:

 initial array [[1 2 3] [2 4 5] [1 2 3]] New resulting array: [[0 0 0] [4 8 10] [3 6 9] ] 

Shop

Gifts for programmers

Learn programming in R: courses

$FREE
Gifts for programmers

Best Python online courses for 2022

$FREE
Gifts for programmers

Best laptop for Fortnite

$399+
Gifts for programmers

Best laptop for Excel

$
Gifts for programmers

Best laptop for Solidworks

$399+
Gifts for programmers

Best laptop for Roblox

$399+
Gifts for programmers

Best computer for crypto mining

$499+
Gifts for programmers

Best laptop for Sims 4

$

Latest questions

PythonStackOverflow

Common xlabel/ylabel for matplotlib subplots

1947 answers

PythonStackOverflow

Check if one list is a subset of another in Python

1173 answers

PythonStackOverflow

How to specify multiple return types using type-hints

1002 answers

PythonStackOverflow

Printing words vertically in Python

909 answers

PythonStackOverflow

Python Extract words from a given string

798 answers

PythonStackOverflow

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

606 answers

PythonStackOverflow

Python os.path.join () method

384 answers

PythonStackOverflow

Flake8: Ignore specific warning for entire file

360 answers

News


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

How to specify multiple return types using type-hints

Printing words vertically in Python

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically