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Fzero is not working

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Shlok Vaibhav Singh
评论： dpb 2019-12-5
isn=1.5;
h=5e-6;
x=2*pi*3e14;
%
fzero(@(y)(tan(sqrt(x.^2.*n^2/const('c')^2-y.^2)*h/2)-sqrt(y.^2-x.^2/const('c')^2./sqrt(x.^2*n^2/const('c')^2-y.^2))))
Fzero is unable to find the root
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Walter Roberson
Walter Roberson 2019-12-5
MATLAB does not do argument reduction for computations like that.
2*3e14 would be exactly representable as a double, by the way.
dpb
dpb 2019-12-5
Yeah, but moving just a tad to find a solution...??? Altho as formulated, I guess it is just a constant so maybe it itself isn't a problem. What is range of y expected to be, I wonder, though?

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