how to store a matrix obtained from for loop into a larger matrix

for i=1:99;
    for j=1:99;
        G(i,j)=((atom_1HHP(i).xyz-atom_1HHP(j).xyz)*transpose(atom_1HHP(i).xyz-atom_1HHP(j).xyz))/(norm(atom_1HHP(i).xyz-atom_1HHP(j).xyz)*norm(atom_1HHP(i).xyz-atom_1HHP(j).xyz));   
    end
end

here atom_1HHP.xyz is a column vector of size 3*1 the value of G(i,j) gives you a matrix of size 3*3.so there is a problem with iteration. somehow the value of G(i,j) cannot be assigned.can anyone help me solve this issue. what is the command i need to use to get the value of G.the final dimension of G is 297*297.

Answer 1

[dpb]

Yours will work if you build G(i,) as a cell array by enclosing the RHS in the "curlies" {} instead of parens. Then cell2mat on the end result well convert it to a 2D double array.