MATLAB: Are we giving {1} in below command … What is the significance ?

Question

C=tf(1, [1 3 2]);

[x, y]=residue(C.num {1}, C.den {1})

temp=0;

syms s t

for i=1:numel(y)

temp=temp+(x(i)/(s-y(i)))

end

Answer 1

C.num and C.den are cell arrays. Check

class(C.num)

Cell arrays are different than simple array in MATLAB. To index a cell array, you need {} brackets.