how to create a function to solve a series of equitions?

Hi Matlab users,

I want to write a function to help me solve a series of equtions, however I'm not sure how to achieve that. here's an example. The problem is that I want to calculate the unknowns 'a','b,'c', so I need to put it in the output of the function, in the mean time they are in the equtions, so I need to define them in the function, but how to define them if they are unkonwns?

function [a,b,c] = EqSol(var1,var2,var3,var4,var5,var6)

eq1 = a + b + c == 1;

eq2 = var3 == var1*a + var2*b;

eq3 = var6*var3 == var4*var1*a + var5*var2*b + c;

eqn = [eq1,eq2,eq3];

S = solve(eqn,[a,b,c]);

end

Answer 1

[VBBV]

if you have symbolic toolbox then you can define it inside the function as

function [a,b,c] = EqSol(var1,var2,var3,var4,var5,var6)
syms a b c

[VBBV]

After solving the equations then return the outputs as

a = S.a
b = S.b
c = S.c

Assuming varx ...1,,6 are known values

[Zhe Dong]

yes that works, many thanks for the help!