I want to use fzero to do so, but I don't know how, since x is a matrix, rather than a symbolic function.
How to find zeros of a function?
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For instance,
x = -3.55:0.1:3.55;
y = x.^2 - 4;
Obviously, when x=2 or -2, y=0.
But I want to know how to use matlab to find zeros of a function y = f(x) when x is a matrix defined by the user like the above case.
3 comentarios
Mark Sherstan
el 17 de Dic. de 2018
Akira Agata
el 17 de Dic. de 2018
If your function is always polynomial, you can use roots function to do this task. Please look at the following help page.
Respuestas (3)
Wenjie
el 17 de Dic. de 2018
3 comentarios
Nico
el 25 de Feb. de 2024
What does the @(x) and the 3 mean? Sorry I'm university student with no experience...
Walter Roberson
el 17 de Dic. de 2018
x(y==0)
Note that this can miss an indefinite number of zeroes of a function if the x do not happen to sample at the right places . It also will not detect zero crossings between x values . You could make use of the results to get hints about zero crossings .
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Alexander
el 25 de Feb. de 2024
If it's not a function but meassured data I would go like this in a first try:
x = -3.55:0.0001:3.55; % assuming 10 kHz sample frequency
y = x.^2 - 4;
yS = sign(y);
dyS = diff(yS);
Z=find(dyS ~= 0);
x(Z)
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