Solving nonlinear equations numerically with fsolve

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Anand Varadharajan
Anand Varadharajan 2020-3-10
回答： Walter Roberson 2020-3-11
Hi all,
How can I compute the unknowns k,a,b in the attachment with non linear equations?
I defined the fuction as:
function F=func1(x);
a=x(1);
b=x(2);
k=x(3);
F(1)=((a^3)-((6*(1-u^2)*Pn)/(pi*E*ROW_INV1*(1-k^2))))*(integral(((1-k^2.*t^2)/(1.-t^2))*dt),0,1);
F(2)=((b^3)-((6*(1-u^3)*Pn*(1-k^2)^(3/2))/(pi*E*ROW_INV1)))*(integral(((1-k^2.*t^2)/(1.-t^2))*dt),0,1);
F(3)=k*a-(sqrt(a^2-b^2));
end
and then called the function as:
x0=[1,1,1]
syms a b k;
x= fsolve(@func1,x0)
But this is not working.
I get an error:

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回答（1 个）

Walter Roberson
Walter Roberson 2020-3-11
Your function uses dt, E, Pn, ROW_INV1, t, u without defining them.
Furthermore, you call integral(expression, lower bound, upper bound) but the first parameter to integral must be a function handle rather than an expression. Anonymous function is acceptable for this purpose.

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