How to input values of the matrix from keyboard in python

Chris Rebert clp2 at rebertia.com
Wed Aug 11 23:13:04 CEST 2010


On Wed, Aug 11, 2010 at 12:06 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Wed, Aug 11, 2010 at 11:43 AM, Pramod <pramo4d at gmail.com> wrote:
>> Hi
>>
>>   I want to know the how we input values into the matrix (N*N size)
>> from keyboard in python,
>>
>> Here I wrote Matrix programe in C++
>>
>> This  asks values from key board and print on the console N*N matrix ;
>>
>> Thanks in advance ....
>>
>>
>> #include<iostream>
>> using namespace std;
>> int main()
>> {
>>        double **a;
>>        int i,j,n;
>>        cout<<"Enter size of the matrix\n";
>>        cin>>n;
>>                for(i=0;i<n;i++){
>>                for(j=0;j<n;j++)
>>                        a[i][j] = random();
>> //or
>>                //cin>>a[i][j];
>>                cout<<endl;
>>        }
>>        for(i=0;i<n;i++){
>>                for(j=0;j<n;j++)
>>                        cout<<a[i][j]<<"\t";
>>                cout<<endl;
>>        }
>>        delete [] a;
>> }
>
> from random import random
> from sys import exit
>
> while True:
>    try:
>        N = int(raw_input("Enter size of the matrix: "))
>    except ValueError:
>        print "Invalid input. Try again."
>    except EOFError:
>        exit(1)
>    else:
>        break
>
> a = [[random() for j in xrange(N)] for i in xrange(N)]
> stringified = "\n".join("\t".join(row) for row in a)
> print stringified

Should have prefaced that with an "untested" disclaimer.
Make that:
stringified = "\n".join("\t".join(str(cell) for cell in row) for row in a)

- Chris



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