MATLAB: Attempted to access hout(1.03323); index must be a positive integer or logical

tmat error hout

I run the codes and an error shows up:

Attempted to access hout(1.03323); index must be a positive integer or logical.

Error in Code1 (line 203)
TMAT=[-qsunN+(Nwall*hout(Tamb-T4))+(Nwall*hskyN(Tsky-T4))+((Nwall*(Kb/Lbriw))*(T3-T4));%T4

My index is not zero and the value of hout=40. Can somebody help me or guide what can be he error?

Thanks

Best Answer

It seems ‘hout’ is a function but it is apparently not in your MATLAB path, so MATLAB is interpreting it as an array.

In the Command Window, type:

which hout -all

and see what the result is.

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We have no idea what all the variable values are, so we can't figure out why it's 230 rows tall instead of 23 rows. My guess is that one of those rows B1 through B23 is a column vector. Just assign B1 through B23 one at a time, then look at the sizes of them all before you concatenate and see which one is not a 1x1 scalar value but is a column vector instead.

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Hi Valentina, hi All,

I have tried to solve the example symbolically and I also did not find a way. When entering

dsolve('DTg=((Tg^2+Tamb^2)*(Tg+Tamb))*(Tamb-Tg)+((Tg^2+Tamb^4)*(Tg+Tamb))*(Tpv-Tg)',...
'DTpv=((Tg^2+Tamb^2)*(Tg+Tamb))*(Tg-Tpv)+(Tf-Tpv)+(Tamb-Tpv)',...
'DTf=((Tpv-Tf)-(Tf2-Tf0))',...
'Tf2=2*Tf-Tf0','Tg(0)=Tamb','Tpv(0)=300','Tf(0)=Tf0');

in MATLAB I get the information that the internal system solver cannot handle this kind of problem.

You probably should be looking for a numerical solution. Since the last equation does not contain derivatives, it may be worth trying a numerical solver which can handle "differential algebraic equations". There are solvers in MATLAB which can handle these kinds of equations. Just search the help for "differential algebraic equations" or DAE (the short form).

Best regards,

-- Kai

Best Answer

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