MATLAB：fzero用矩阵作为输入函数？

Question

I am trying to find the value x for a function f(x,y) that produces the function value 0 for a given y. In Matlab I write a small function handle, eg

minme = @(y,x) y-x.^2;

and use the fzero function to find that value of x, call it x*.

So eg

fzero(@(x) minme(5,x),1)

works great. However, now I want to find x* for a large vector of values of y, called Y. Putting

minme(Y,x)

for some value of x works.

Now I was trying something like

fzero(@(x) minme((3:1:5),x),1)

and fzero(@(x) minme(Y,x),1)

but that produces an error: ??? Operands to the || and && operators must be convertible to logical scalar values. Error in ==> fzero at 333 elseif ~isfinite(fx) || ~isreal(fx)

Does anybody know whether there is a way to do this?

Thanks, Immo

Answer 1

看一下这个

arrayfun(@(i) fzero(@(x) minme(y(i),x),1),1:numel(y))