Cell array variable problem

Dear Community,

I am facing a rather basic problem but unfortunately I cannot fix it:

I have a nested loop that gives me as output a 324x324 cell that contains in each variable a associated matrix of 3x3. In addition, the important values are placed in the diagonal of the cell array, while the rest of the variables should be zero matrices of 3x3. the problem is that, I cannot assign the zero matrix to the remaining variables. The code goes as follow:

K_TANK_TOTAL = [K_tank_reinforcement;K_reinforcement;K_spherical_dome];

Structure_Global_Stiffness = cell(324,324);

Matrix_0 = zeros(3,3);

for kk = 1:324

for mm = 1:324

if (kk==1) && (kk==mm)

Structure_Global_Stiffness{kk,kk} = K_TANK_TOTAL{kk,1};

Structure_Global_Stiffness{kk,kk+1} = K_TANK_TOTAL{kk,2};

elseif (kk==mm) && (kk<98)

Structure_Global_Stiffness{kk,kk-1} = K_TANK_TOTAL{kk,1};

Structure_Global_Stiffness{kk,kk} = K_TANK_TOTAL{kk,2} + K_TANK_TOTAL{kk+1,1};

Structure_Global_Stiffness{kk,kk+1} = K_TANK_TOTAL{kk+1,2};

elseif (kk==mm) && (kk==98)

Structure_Global_Stiffness{kk,kk-1} = K_TANK_TOTAL{kk,1};

Structure_Global_Stiffness{kk,kk} = K_TANK_TOTAL{kk,2} + K_TANK_TOTAL{kk+1,1} + K_TANK_TOTAL{197,1};

Structure_Global_Stiffness{kk,kk+1} = K_TANK_TOTAL{kk+1,2};

Structure_Global_Stiffness{kk,kk+2} = K_TANK_TOTAL {197,2};

elseif (kk==mm) && (kk>98) && (kk<324)

Structure_Global_Stiffness{kk,kk-1} = K_TANK_TOTAL{kk,1};

Structure_Global_Stiffness{kk,kk} = K_TANK_TOTAL{kk,2} + K_TANK_TOTAL{kk+1,1};

Structure_Global_Stiffness{kk,kk+1} = K_TANK_TOTAL{kk+1,2};

elseif (kk==mm) && (kk==324)

Structure_Global_Stiffness{kk,kk-1} = K_TANK_TOTAL{kk,1};

Structure_Global_Stiffness{kk,kk} = K_TANK_TOTAL{kk,2};

else

Structure_Global_Stiffness{kk,zz} = Matrix_0; % HERE I HAVE MY PROBLEM

end

end

end

how can I solve this?

Thank you!

Answer 1

[madhan ravi]

 Structure_Global_Stiffness{kk,zz}(~eye(3)) = 0;

[Marcelo Boldt]

I tried your approach and then, when I tried to apply cell2mat gives me the following error : Error using cat

Dimensions of arrays being concatenated are not

consistent.

[madhan ravi]

If each cell is 3 x 3 then it’s shouldn’t error out.

[Marcelo Boldt]

the mistake was located in the indexes, i mixed mm for zz! Thanks anyways!