MATLAB: I need help figuring out the code to solve 6 non linear equation

mathMATLABsystem of equations

Here is my code:
syms a b c d e f
oBal=(-a*2) + c*2 + d*2 + e*2+f*1==0;
cBal=c*4+e*1==6;
hBal=c*7+d*8+f*2-(12+b*3)==0;
nBal=(-b*1)+c*1==0;
Rq=e/a==1.3;
Y=(c*101.1039)/(112.1265)==0.5;
sol=solve(oBal,cBal,hBal,nBal,Rq,Y);
sol.a;
sol.b;
sol.c;
sol.d;
sol.e;
sol.f;
disp(a)
disp(b)
disp(c)
disp(d)
disp(e)
disp(f)

Best Answer

Hi,
your code is ok - just convert the symbolic results to numeric:
syms a b c d e f
oBal=(-a*2) + c*2 + d*2 + e*2+f*1==0;
cBal=c*4+e*1==6;
hBal=c*7+d*8+f*2-(12+b*3)==0;
nBal=(-b*1)+c*1==0;
Rq=e/a==1.3;
Y=(c*101.1039)/(112.1265)==0.5;
sol=solve(oBal,cBal,hBal,nBal,Rq,Y);
format long
sol_a = double(sol.a)
sol_b = double(sol.b)
sol_c = double(sol.c)
sol_d = double(sol.d)
sol_e = double(sol.e)
sol_f = double(sol.f)
format short
gives:
sol_a =
     2.909196152898918
sol_b =
     0.554511250307852
sol_c =
     0.554511250307852
sol_d =
     3.872758845869675
sol_e =
     3.781954998768593
sol_f =
   -10.600057884094404
Best regards
Stephan
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