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)


' formats array im() of size ims
for ims = 4 to 6
 
print :print "--- Size: ";ims;" ---"
 Dim im(ims,ims)
 
 For i = 1 To ims
   im(i,i) = 1
 next 
 
 For row = 1 To ims
   print "[";
   cma$ = ""
     For col = 1 To ims
       print cma$;im(row, col);
       cma$ = ", "
    next
   print "]"
 next
next ims