fsolve with functions inside script

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franco otaola
franco otaola 2019-9-16
评论： Matt J 2019-9-16
hello,
i am looking for a way to use fsolve in equations that some of the parameters are defined in the same script.
i am trying to enter A,B in the script, then use fsolve to solve a equation that is for example A+B/x
A=3;
B=2;
x0=1;
fsolve(fun,x0);
function F=fun(A,B,x)
A=A;
B=B;
F=A+B/x
end
and i am having the error that the argument in fsolve initial point is not the right size, i understand that it is because i defined fun as a function of A,B,x so it would expect an array of three values. but if i not define that way how can i put inside the function the desired values that are previously introduced(A and B)?
thanks

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回答（1 个）

Matt J
Matt J 2019-9-16
A=3;
B=2;
x0=1;
fsolve(@(x)fun(A,B,x) ,x0);
function F=fun(A,B,x)
A=A;
B=B;
F=A+B/x
end

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