MATLAB: Am I receiving “Error using ones Size inputs must be scalars” when I try to get submatrix with this function

domainkronMATLABMATLAB and Simulink Student Suitematlab functionmatrixsubdomainsubmatrix

Having the next code:
function m=submatrix(k,N)
	%% returns submatrix where k is placed
	%% N => NxN matrix
	n=sqrt(N); 
	%% create submatrix of nx n elements with different number in order to identify them
	aa=[];
	aa=kron(1:n,ones(n,n));
	b=aa;
	for i=1:n-1
		b=[b;aa+n*i];
	end
	vv=b(k);
	m=find(b==vv);
end
These are my input parameters:
N =   [1 4 3 2;
       3 2 4 1;
       4 1 2 3;
       2 3 1 4];
   
k = 1;
k = 1 would be 1×1 = 1
k = 5 would be 1×2 = 4
I keep getting an error in line 7: aa=kron(1:n,ones(n,n)), and I'm totally clueless; I tried modifying kron values with similars but I keep getting that.

Best Answer

Then you can't do ones(n,n) since
>> n=sqrt(N)
n =
    1.0000    2.0000    1.7321    1.4142
    1.7321    1.4142    2.0000    1.0000
    2.0000    1.0000    1.4142    1.7321
    1.4142    1.7321    1.0000    2.0000
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