python program to generate n*n matrix from user input

Question

I want to generate a n*n matrix from user inputing the value of n and elements of the matrix.

Following is the code:

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):
    for j in range(n):
        mat[i][j]=input()
print(mat)

but I am getting output like this

[[1. 2.]

 [3. 4.]]

with a . (point) after the numbers which I don't want. Is there any way to get this with using loops and array only not NumPy?

Sheldore · Accepted Answer · 2018-09-23 16:15:47Z

7

You were almost close. You just have to declare the datatype as dtype=int while initializing your matrix as

mat=np.zeros((n,n), dtype=int)

and then you won't have dots but just

[[1 2]
[3 4]]

answered Sep 23, 2018 at 16:15

Sheldore

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Comments

Shan · Accepted Answer · 2018-09-23 16:16:05Z

5

It's because np.zeros by default assigns it's values to float. To change that replace line: mat=np.zeros((n,n))

with:

mat=np.zeros((n,n), dtype=int)

It will give you output you want.

Also good practice is to use help() on used methods, to know what can be done with them, like in this example.

answered Sep 23, 2018 at 16:16

Shan

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Comments

Abhish · Accepted Answer · 2018-09-23 19:32:27Z

2

You can use this:

n =  int(input())

mat=[[int(input()) for x in range(n)] for i in range(n)]

You can convert above list into numpy as

np_mat = numpy.asarray(mat)

If you want to input each row at a time,with each element separated by a space, you can do like this.

mat=[list(map(int, input().split())) for i in range(n)]

edited Sep 23, 2018 at 19:32

answered Sep 23, 2018 at 16:36

Abhish

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Comments

Harish Yadav · Accepted Answer · 2018-09-25 12:58:36Z

m=int(input("enter matrix row size"))
n=int(input("enter matrix column size"))

Mat1 = []
Mat2 = []
Mat3 = []

for i in range(m):
    Mat1.append([0]*n)
print (Mat1)

for j in range(m):
    Mat2.append([0]*n)
print (Mat2)

for k in range(m):
    Mat3.append([0]*n)
print (Mat3)


for i in range(m):
    for j in range(n):
        print ('enter in Matrix 1 row: ',i+1,' column: ',j+1)
        Mat1[i][j] = int(input())

for k in range(m):
    for l in range(n):
        print ('enter in MAtrix 2 row: ',k+1,' column: ',l+1)
        Mat2[k][l] = int(input())

for p in range (m):
    for q in range (n):
        Mat3[p][q]=Mat1[p][q]+Mat2[p][q]
        #print(Mat1[p][q]+Mat2[p][q])`z

print (Mat1)        
print (Mat2)
print (Mat3)

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