Function as sum of functions in fsolve

Question

Saeid 2017-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/331620-function-as-sum-of-functions-in-fsolve

评论： Walter Roberson 2017-3-23

I want to solve a set of nonlinear equations over two unknowns x(1) & x(2), e.g. in the form:

where factors a(i), b(i), k(j) and m(j) are known. I am not aware of how I can define the function: fun= @ (x) in a loop. Some help here would be really appreciated! Saeid

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Answer 1

Matt J 2017-3-23

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Just like you would without a loop. I assume you mean a loop over j...

      asum=sum(a);
      bsum=sum(b);
   for j=1:length(k)
     fun=@(x) myfun(x,asum,bsum,m(j),k(j));
     xsol(j)=fsolve(fun,...)
   end
function F=myfun(x, asum,bsum, mj,kj)
   x1=x(1); x2=x(2);
   F=[asum*x1^2+bsum*x1*x2^2 - kj  ; you_fill_in_the_rest]
end