taking n*n matrix input by user in python

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I am starting to code in python. When I was to take two inputs from user with a space between the two inputs my code was like

 min, p = input().split(" ")  
min=int(min)
p=float(p)

which worked fine. In another such problem I am to take a n*n matrix as user input which I declared as arr=[[0 for i in range(n)] for j in range(n)] printing the arr gives a fine matrix(in a single row though) but I am to replace each element '0'with a user input so I use nested loops as

for i in range(0,n)
    for j in range(0,n)
       arr[i][j]=input()

this also worked fine but with a press of 'enter' button after each element. In this particular problem the user will input elements in one row at space instead of pressing 'enter' button. I wanted to know how to use split in this case like in first case above, keeping in mind the matrix is n*n where we don't know what is n. I prefer to avoid using numpy being a beginner with python.

#Take matrix size as input
n=int(input("Enter the matrix size"))

import numpy as np

#initialise nxn matrix with zeroes
mat=np.zeros((n,n))

#input each row at a time,with each element separated by a space
for i in range(n):
   mat[i]=input().split(" ")
print(mat)  

taking n*n matrix input by user in python, You can do this: rows = int(input("Enter number of rows in the matrix: ")) columns = int(input("Enter number of columns in the matrix: ")) matrix  Take Matrix input from user in Python. Matrix is nothing but a rectangular arrangement of data or numbers. In other words, it is a rectangular array of data or numbers. The horizontal entries in a matrix are called as ‘rows’ while the vertical entries are called as ‘columns’.

You can do this:

rows = int(input("Enter number of rows in the matrix: "))
columns = int(input("Enter number of columns in the matrix: "))
matrix = []
print("Enter the %s x %s matrix: "% (rows, columns))
for i in range(rows):
    matrix.append(list(map(int, input().rstrip().split())))

Now you input in the console values like this:

Enter number of rows in the matrix: 2
Enter number of columns in the matrix: 2
Enter the 2 x 2 matrix:
1 2
3 4

Matrix input in N*N form in Python, If you know what format the user will be using, you can simplify the reading quite a bit. If the user simply enters the nested list (in this case [[1,3]  The two main datatypes for storing matrices in Python (other that the nested list that you use here) are Numpy arrays and Pandas dataframes. Both Numpy and Pandas support reading files, for instance see these links for Numpy and Pandas.

You can try this simple approach (press enter after each digit...works fine)::

m1=[[0,0,0],[0,0,0],[0,0,0]]
for x in range (0,3):
    for y in range (0,3):
        m1[x][y]=input()
print (m1)

What is the Python code for the user input matrix of an m*n order , Luckily, there are simple steps you can take to dramatically reduce Google's tracking. But first, what exact Continue Reading. I have an experience in java and c++ for 7 years now. I recently started learning python. Can someone please help me on how to read the input for the matrix and display the same in matrix format. T

Try something like this instead of setting the matrix one by one using existing list(s):

# take input from user in one row
nn_matrix = raw_input().split()
total_cells =  len(nn_matrix)
# calculate 'n'
row_cells = int(total_cells**0.5)
# calculate rows
matrix = [nn_matrix[i:i+row_cells] for i in xrange(0, total_cells, row_cells)]

Example:

>>> nn_matrix = raw_input().split()
1 2 3 4 5 6 7 8 9
>>> total_cells =  len(nn_matrix)
>>> row_cells = int(total_cells**0.5)
>>> matrix = [nn_matrix[i:i+row_cells] for i in xrange(0, total_cells, row_cells)]
>>> matrix
[['1', '2', '3'], ['4', '5', '6'], ['7', '8', '9']]
>>> 

Python program addition of two matrix, Program to add two matrices using nested loop A=[] n=int(input("Enter N for N x N matrix : ")) #3 here #use list for storing 2D array #get the user  Program to multiply two Matrix by taking data from user. Given two matrices, the task is to multiply them. The size and number of elements of matrices are to be read from the keyboard.

>>> import math
>>> line = ' '.join(map(str, range(4*4))) # Take input from user
'0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15'
>>> items = map(int, line.split()) # convert str to int
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
>>> n = int(math.sqrt(len(items))) # len(items) should be n**2
4
>>> matrix = [ items[i*n:(i+1)*n] for i in range(n) ]
[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15]]

Matrix implementation in Python - IncludeHelp, Program to input matrix with m*n and print the numbers in matrix format. import random m = input("Enter No. of rows in the matrix: ") n  This is an interesting question because Python does not have an array type. If you import numpy then indeed you can make dimensioned arrays of the same type of elements. But in standard Python you would have to use a list containing lists to simulate an m x n array. Of course that would not require that all elements be the same type.

Python Exercise: Generates a two-dimensional array, Python Conditional: Exercise-11 with Solution. Write a Python program which takes two digits m (row) and n (column) as input and generates a two-​dimensional array. Enter user input: Input number of rows: Submit. Python  Taking input in Python. Developers often have a need to interact with users, either to get data or to provide some sort of result. Most programs today use a dialog box as a way of asking the user to provide some type of input. While Python provides us with two inbuilt functions to read the input from the keyboard.

add two matrix by inputing data from keyboard, #getting dimension of matrix print "enter n for nxn matrix" n = input() matrix1 = [] matrix2 = [] #taking elements of first matrix print "Enter elements of first matrix" for i​  Construct a unique matrix n x n for an input n Given an odd integer n, find a matrix of size n x n with following conditions: Each cell contains an integer from 1 and n (inclusive).

Python Matrix and Introduction to NumPy, However, there is a better way of working Python matrices using NumPy package​. NumPy is a package for scientific computing which has support for a powerful N-​dimensional array object. Hence, this array can take values from -2-31 to 2-31-​1 . of corresponding elements of two arrays) not matrix multiplication. How to make a 2D list or matrix in Python and take a input from user. This channel gives you the video on Programming language, Technology, Latest Trends, Motivational Video and exam alert of MCA

Comments
  • What stops you from reading an input line, splitting her to a list, checking number of elements and possible conversion to numbers and copying them to your matrix as one row?
  • and if you want to enter 1000*1000 matrix what should you do ?
  • just change the values in range (for loops) for both 'row for loop' and 'column for loop': "for x in range (0,1000)" and "for y in range (0,1000)"
  • so describe it in your answer
  • Code not intended
  • You can copy and paste this as it is ,then it will run
  • a =[] is not intended