How would I use fzeros in this?

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James Crowe
James Crowe 2017-12-8
回答： M 2017-12-8
Hi I want to use fzeros, but I'm not sure what to do to make it work in my code. You can probably understand what I'm trying to do, so I won't explain. Thank you
f = @myFunction
n = -6:6
x0 = n*pi
z = fzero(f, x0)
  2 个评论
M
M 2017-12-8
Did you read this ? https://fr.mathworks.com/help/matlab/ref/fzero.html
x = fzero(fun,x0) tries to find a point x where fun(x) = 0
How is myFunction defined ?
James Crowe
James Crowe 2017-12-8
I have read that and not sure how to do it still. My function is defined as:
function [y] = myFunction(x)
y = 3*sin(5*x)+2*cos(x.^1);
end

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回答（1 个）

M
M 2017-12-8
If you read the documentation, you should have notice that second input argument must be a scalar or a 2-elements vector.
This is not the case with your example.
Try with
f = @myFunction
x0 =[1 -1];
z = fzero(f, x0);
myFunction(z)
ans =
-4.4409e-16
or
f = @myFunction
x0=0;
z = fzero(f, x0);
myFunction(z)
ans =
0

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