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Array indices must be positive integers or logical values.

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My code keeps outputting this error:
i = 0;
x1 = xi - f(xi)./df(xi);
while abs(f(x1)) > precision
i = i + 1;
x1 = xi - f(x1)/df(xi)
end
  • Array indices must be positive integers or logical values.
Can anyone suggest a fix?

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Accepted Answer

madhan ravi
madhan ravi on 31 May 2020
f & df should be a function handle , can't see how you defined so it might be the issue.

More Answers (1)

Image Analyst
Image Analyst on 31 May 2020
You're passing in x1 and xi as array indexes. These are most likely floating point numbers, not integers or logical values. See the FAQ for a thorough discussion: https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_positive_integers_or_logicals..22

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