Subscripted assignment dimension mismatch (size [1 x 1] ~= size [30 x 30]).

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MICHELE 2014-5-7

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https://ww2.mathworks.cn/matlabcentral/answers/128728-subscripted-assignment-dimension-mismatch-size-1-x-1-size-30-x-30

评论： MICHELE 2014-5-8

Hi, I am new on MATLAB/SIMULINK environemt. I am trying to add a matlab function box inside a simulink model. I am importing some of the input signals from the workspace but i got the errors: Subscripted assignment dimension mismatch (size [1 x 1] ~= size [30 x 30]).

Also, how should the input dimensions be related to the script?

Below the script of the matlab fcn block

Thanks a lot

function T_sb1 =fcn(Tg,T_f,m1,U_p1)
cp=4.186;
L=30;
n=10;
dx=L/(n+1);
dt=900;
D=150;
dV=((D/(2*1000))^2)*pi*dx;
dA=((D/1000)*dx*pi);
A=((D/(2*1000))^2*L*pi);
% m1=0.5;
ro=1000;
B=(1+((m1/(dV*ro))*dt)+(U_p1*dA*dt/(2*dV*ro*cp)));
C=(m1*dt/(dV*ro));
D=(U_p1*dA*dt/(2*dV*ro*cp));
T=zeros(n,n);
for j=1:n,
     for  i=1:n,
        T(1,1)=Tg;
        T(i+1,1)=Tg;
        T(1,j+1)=T_f;
        T(i+1,j+1) = (T(i+1,j)+C*(T(i,j+1))-D*(T(i,j+1))+(D*2*Tg))/B;
    end
end
T_sb1=T(n,:)';

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MICHELE 2014-5-8

编辑：MICHELE 2014-5-8

ok the 35040 are the recorded temp for each 15min of 1 year. T(1,1) represents the starting point, where the temp are equal to the ambient temp. I could overcome this one, simply assigning a constant average value. but for the rest of them, say T(1,j+1)=T_f or T(i+1,j+1) = (T(i+1,j)+C*(T(i,j+1))-D*(T(i,j+1))+(D*2*Tg))/B I want that at each j the code should consider each single T_f value (of the 35040 ones) as well as for m1 (included in B and C calculation). Clearly, I could consider instead of 1year, 1week or 1day but I think the prob would be the same.

MICHELE 2014-5-8

I forgot to mention that ambient temp is Tg and that the purpose of the model will be to simulate the temp profile of my system considering the ambient temp and T_f (which represent the temp coming in from the heat generation point).

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