watch_fzero_simple - y = x.^2 1.e-8 no zero elseif which_f...

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function [x_zero, f_zero, nr_iter] = ... watch_fzero_simple(which_f, x0_or_ab, pause_time) colors = 'kgbmc'; nr_iter = 0; hold off [x_zero, f_zero] = fzero(@f, x0_or_ab); plot(x_zero, f_zero, 'rs') disp(['# iterations = ', num2str(nr_iter)]) function y = f(x) %%%%% nested function nr_iter = nr_iter + 1; if which_f == 1 y = exp(-x); % no zero elseif which_f == 2 y = x.^2 - 1.e-8; % zero at #1e-4 elseif which_f == 3; %
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Unformatted text preview: y = x.^2 + 1.e-8; % no zero elseif which_f == 4 y = tanh(x + 5); % zero at -5 elseif which_f == 5 ............. % you can easily add more % . ... end ic = mod(nr_iter, 5) + 1; if nr_iter==1 plot(x, y, 'rd') %first iterate else plot(x, y, ['.', colors(ic)],'MarkerSize',20) end hold on shg set(gca,'FontSize',20) drawnow; pause(pause_time) end %%%%% end of nested function end...
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