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    %% More Information from Solution  
% Find the point where |exp(-exp(-x)) = x|, and display information about
% the solution process.   

% Copyright 2015 The MathWorks, Inc.


%%  
fun = @(x) exp(-exp(-x)) - x; % function
x0 = [0,1]; % initial interval
options = optimset('Display','iter'); % show iterations
[x,fval,exitflag,output] = fzero(fun,x0,options) 

%%
% |fval| = 0 means |fun(x) = 0|, as desired.