erfenfa.rar_二分法 matlab

function x3=erfenfa(x1,x2) % function varargout=erfenfa(x1,x2) % 用二分法求解非线性方程， % 输入变量为x1,x2,输出变量为x3 clc tic nargout=3; x1=0;x2=1;%非线性方程的区间 k=0;%迭代步数 while k<=4 % while abs(x2-x1)/2>1e-10 x3=(x2+x1)/2; fx1=3*x1+sin(x1)-exp(x1); fx3=3*x3+sin(x3)-exp(x3); % fx1=x1^3+x1^2-3*x1-3; % fx3=x3^3+x3^2-3*x3-3; if fx1*fx3<0 x2=x3; else x1=x3; end k=k+1; end x3 k fx3 toc