有關拋物線內插法

780318zxc

想請問有關拋物線內插法的誤差值ea該怎麼設定才對

function [x,fx,ea,iter]=inter(f,x1,x2,x3,es,maxit,varargin)
% goldmin: minimization golden section search
%   [x,fx,ea,iter]=goldmin(f,xl,xu,es,maxit,p1,p2,...):
%     uses golden section search to find the minimum of f
% input:
%   f = name of function
%   xl, xu = lower and upper guesses
%   es = desired relative error (default = 0.0001%)
...

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