Adding input parameters to a function

2017 3 14
1 个回答
更新时间：2017 3 15
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So I have a function that uses fsolve to solve for two variables, lmb_1 and lmb_2. There are two other variables that I'd like to plug into the function. something like root2d(x, phi_0,k) so that I don't have to keep changing the phi_0 and k values in the root2d function.
function F = root2d(x)
phi_0=0.2;
k=0.1;
lmb_1=x(1);
lmb_2=x(2);
s_i = x(1);
s_ii = x(2);
expression_i = phi_0*(k - s_i) + k^2/2 - s_i^2/2 - lmb_1*lmb_2*(log(k) - log(s_i));
expression_ii = phi_0*s_ii - phi_0 - s_ii^2/2 + lmb_1*lmb_2*log(s_ii) + 1/2;
F(1) = expression_i-expression_ii;
F(2) = x(1)-x(2)+phi_0;
end
x0 = [1,1];
answer = fsolve(@root2d,x0)

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回答（1 个）

Walter Roberson
Walter Roberson 2017-3-14

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Noor Ahmad
Noor Ahmad 2017-3-15
编辑：Walter Roberson 2017-3-15
So I attempted this but, when I call the function:
answer=Lambda1and2Solver_n_1(0.2,0.2,[1 1])
I get a exceeds matrix error.
function F = Lambda1and2Solver_n_1(phi_0,k,x0)
F = fzero(@Solver,x0);
function F = Solver(x)
phi_0=0.2;
k=0.1;
lmb_1=x(1);
lmb_2=x(2);
s_i = x(1);
s_ii = x(2);
expression_i = phi_0*(k - s_i) + k^2/2 - s_i^2/2 - lmb_1*lmb_2*(log(k) - log(s_i));
expression_ii = phi_0*s_ii - phi_0 - s_ii^2/2 + lmb_1*lmb_2*log(s_ii) + 1/2;
F(1) = expression_i-expression_ii;
F(2) = x(1)-x(2)+phi_0;
end
end
Walter Roberson
Walter Roberson 2017-3-15
phi_0 = 0.2;
k = 0.1;
x0 = [1 1];
F = fzero(@(x) Lambda1and2Solver_n_1(x, phi_0, k), x0);
function F = Lambda1and2Solver_n_1(x, phi_0, k)
lmb_1=x(1);
lmb_2=x(2);
s_i = x(1);
s_ii = x(2);
expression_i = phi_0*(k - s_i) + k^2/2 - s_i^2/2 - lmb_1*lmb_2*(log(k) - log(s_i));
expression_ii = phi_0*s_ii - phi_0 - s_ii^2/2 + lmb_1*lmb_2*log(s_ii) + 1/2;
F(1) = expression_i-expression_ii;
F(2) = x(1)-x(2)+phi_0;
end

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