fzero: not a valid initial bracketing

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Pedro Almeida 2022-12-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1876052-fzero-not-a-valid-initial-bracketing

关闭： Walter Roberson 2022-12-12

在 MATLAB Online 中打开

format long
y = @(x) 1 - sin(x);
z = @(x) x.^2;
test1 = @(x) (y(x)-z(x));
test2 = @(x) (z(x) - y(x));
ta = 0;
a = 0;
dados = [];
zero = fzero(test1,[0 1])
while (ta != 1)
  a = a + 1;
  y1 = @(x) (a - sin(x));
  funcao = @(x) (y1(x) - z(x));
  intervalo = [0+a 1+a];
  ta = fzero(funcao, intervalo);
  if (ta = 1)
    dados = [dados, a];
  endif
endwhile
disp(dados)

It gives me that error and I don't really know how to fix it. Any help would me appreciated!!

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Torsten 2022-12-12

编辑：Torsten 2022-12-12

Your code is weird and in part not MATLAB compatible:

while / endwhile does not exist in MATLAB; it's while / end

ta != 1 has to be replaced by ta ~= 1

if (ta = 1) has to be replaced by if ta==1

Maybe you should explain in your own words what you try to do.

The error message means that the interval you provided as initial guess for fzero does not satisfy that the function, applied to the endpoints of this interval, gives values that differ in sign.

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