MATLAB: How to solve 4 equations with 4 unknowns using matlab

4equationsMATLABnonlinearunknowns

I'm attempting to use matlab to solve a set of 4 nonlinear equations with 4 unknowns. This is what I've entered so far, but it keeps saying it cant find a solution. Any suggestions?
mf=.12;
Yfin=.0826;
Kg=(6.19*10^9)*exp(-15098/298);
MW=29;
V=.000268;
P=101325;
R=8315;
M=.1;
N=1.65;
Yoxin=.9174;
AF=16;
Hf=40000000;
Cp=1200;
Tin=298;
eqn1='mf*(Yfin-R1)-Kg*MW*V*((P/R*R2)^(M+N))*(((R1^M)*((.233*R3)^N))/1)'
eqn2='mf*(Yoxin-R1)-(AF)*Kg*MW*V*((P/R*R2)^(M+N))*(((R1^M)*((.233*R3)^N))/1)'
eqn3='1-R1-R3-R4'
eqn4='(R1-Yfin)*Hf+Cp*(R2-Tin)'
sol=fsolve(eqn1,eqn2,eqn3,eqn4,'R1','R2','R3','R4')

Best Answer

I suggest you try to solve it numerically using 'fsolve' rather than symbolically.
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