# Assign letters as matrices; inputs

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Patricia Bracer on 10 Nov 2015
Answered: Joachim Schlosser on 10 Nov 2015
I try to write a function that takes as its input argument a scalar integer and returns Q, a 2n-by-2n matrix. Q consists of four n-by-n submatrices. The elements of the submatrix in the top left corner are all 1s, the elements of the submatrix at the top right are 2s, the elements in the bottom left are 3s, and the elements in the bottom right are 4s. My main problem is that I do not know how to assign 's' in the matrix. Any help will be appreciated
function Q = quadrants( n )
M=zeros(2*n)
s = sym('s')
for i=1:n
for j=1:n
M(i,j)=s
end
end
for i=1:3
for j=(n+1): end
M(i,j)=2*s
end
end
for i=(n+1):2*n
for j=1:n
M(i,j)=3*s
end
end
for i=(n+1):2*n
for j=(n+1):2*n
end
end
end

Thorsten on 10 Nov 2015
You can create a numerical matrix without for loops using
O = ones(n);
Q = [O 2*O; 3*O 4*O]
dpb on 10 Nov 2015
Why not move this to Answer so OP can accept it?
Guillaume on 10 Nov 2015
Possibly because the OP question is about symbolic variables.