Error with vpasolve - 'Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.'

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James Kennedy
James Kennedy on 13 Nov 2021
Answered: Srivardhan Gadila on 16 Nov 2021
Hi,
I am having an issue with the vpa solve with the above stated error.
z=-1.82085;
T.ci=2.954735961685622e+02;
del.eff=(params.Dci-params.Dfo)/2; % m
epsilon.f=1;
epsilon.c=1;
params.Le=4; % m
params.qmax=38E3; %W m^-1
params.Dci=8.4E-3; % m
params.Dfo=8.3E-3; % m
R.ci=params.Dci/2;
R.fo=params.Dfo/2;
R.g=(R.fo+R.ci)/2;
qp.i1=params.qmax*cos(pi*z(i)/params.Le);
syms Tfo
Tci=T.ci(i)+273.15; %Kelvin
k.gas=15.8E-4*((Tfo+Tci)/2)^.79;
qpp.i1=qp.i1/(2*pi*R.g);
int_term=5.67E-8/(epsilon.f^-1+epsilon.c^-1-1);
htc_g.open=k.gas/del.eff+int_term*(Tfo^4-Tci^4)/(Tfo-Tci);
T.fo(i)=vpasolve(qpp.i1/(Tfo-Tci)==htc_g.open,Tfo)-273.15;
T.fo(i) should be something around 336.7, thank you

Answers (1)

Srivardhan Gadila
Srivardhan Gadila on 16 Nov 2021
As the error message suggests, somewhere in your code, where the error appears, you are incorrectly indexing the variable on the LHS (left side) or assigning value from RHS (right side) which has different/incompatible size.
You can check the following page for Answers related to similar issue: Help Center - MathWorks. You can debug the issue by Setting Breakpoints on the line which is causing the error in your main code file.

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