Task

Build an   identity matrix   of a size known at run-time.



An identity matrix is a square matrix of size n × n,

where the diagonal elements are all 1s (ones),

and all the other elements are all 0s (zeroes).







I

n


=


[



1


0


0


⋯


0




0


1


0


⋯


0




0


0


1


⋯


0




⋮


⋮


⋮


⋱


⋮




0


0


0


⋯


1



]




{\displaystyle I_{n}={\begin{bmatrix}1&0&0&\cdots &0\\0&1&0&\cdots &0\\0&0&1&\cdots &0\\\vdots &\vdots &\vdots &\ddots &\vdots \\0&0&0&\cdots &1\\\end{bmatrix}}}





Related tasks

   Spiral matrix
   Zig-zag matrix 
   Ulam_spiral_(for_primes)


import extensions;
import system'routines;
import system'collections;
 
public program()
{
    var n := console.write:"Enter the matrix size:".readLine().toInt();
 
    var identity := new Range(0, n).selectBy:(i => new Range(0,n).selectBy:(j => (i == j).iif(1,0) ).summarize(new ArrayList())) 
                         .summarize(new ArrayList());
 
    identity.forEach:
        (row) { console.printLine(row.asEnumerable()) }
}