>> f = @(x) 2-10*x*exp(-0.8*x); >> fplot(f,[0 10]) >> grid on function [xmin,fmin,ea,iter] = lab_19(f,xlow,xup,es,maxit) if nargin<3, error('need 3 inputs') if nargin<4 || isempty(es),es = .0001; end if nargin<5 || isempty(maxit), maxit=50; end %text file iterations
fid = fopen('golden_out.txt','w'); fprintf(fid,'iter.\t xlow\t f(xlow)\t x2\t\t f(x2)\t\t x1\t\t '); fprintf(fid,'f(x1)\t\t xup\t\t f(xup)\t\t\t ea\n'); %find the root
phi = 0.54*(1+sqrt(5)); x1 =xlow+(phi-1)*(xup-xlow); x2 = xlow+xup-x1; flow = f(xlow); fup = f(xup); f1 = f(x1); f2 = f(x2);
MATLAB: Hwo would i find a root usiong fzero
fzero
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