I am using a simple code to calculate solution of three nonlinear equations using fsolve. But i get the error saying "Error using vertcat Dimensions of matrices being concatenated are not consistent." I checked the dimensions they are equal. Help!

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Daniyal Ali
Daniyal Ali 2014-10-18
评论： Star Strider 2014-10-18
k=1.38*10^-23;
T=25+273;
q=1.6*10^-19;
Vt=k*T/q;
Jsc=12.5e-3;
Voc=0.951;
Rp=118000;
Vmp=0.833;
Jmp=11.15e-3;
f=@(z) [4.735 - ((z(2).*Vt)/Jsc)- z(1) +0*z(3);
(Jsc-(Voc/Rp))/(exp(Voc/(z(2).*Vt)-1))-z(3) + 0*z(1);
z(3).*(exp((Vmp-Jmp.*z(1))/(z(2).*Vt))-1)+ (Vmp-Jmp.*z(1))/Rp - Jsc -Jmp];
fsolve(f,[1;1;1e-6])

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Star Strider
Star Strider 2014-10-18
In matrix calculations, MATLAB interprets any spaces between operations as different elements. Take out the spaces and it works:
f=@(z) [4.735-((z(2).*Vt)./Jsc)-z(1)+0*z(3);
(Jsc-(Voc./Rp))/(exp(Voc./(z(2).*Vt)-1))-z(3)+0*z(1);
z(3).*(exp((Vmp-Jmp.*z(1))./(z(2).*Vt))-1)+ (Vmp-Jmp.*z(1))./Rp-Jsc-Jmp];
ze = fsolve(f,[1;1;1e-6])
produces:
ze =
2.7061e+000
986.7183e-003
422.4400e-018

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