OptimizationTechniques/Work 3/scripts/Script_1_SteepDesc.m

30 lines
1.1 KiB
Matlab

% Define environment (functions, gradients etc...)
GivenEnv
% Define parameters
max_iter = 1000; % Maximum iterations
tol = 1e-4; % Tolerance
% Point x0 = (1, 1)
% =========================================================================
point = 1;
x0 = [5, -5]';
point_str = "[" + x0(1) + ", " + x0(2) + "]";
f = fun(x0);
gf = grad_fun(x0);
hf = hessian_fun(x0);
fprintf('Initial point (%d, %d), f = %f, grad = [%f;%f], hessian = [%f %f ; %f %f]=> Method applicable\n', x0, f, gf, hf);
for g=[0.1, 0.3, 0.5, 3, 5]
gamma_fixed_step = g;
[x_fixed, f_fixed, kk] = method_SteepDesc(fun, grad_fun, x0, tol, max_iter, 'fixed');
fprintf('Fixed step g=%f: Initial point (%f, %f), steps:%d, Final (x1,x2)=(%f, %f), f(x1,x2)=%f\n', g, x0, kk, x_fixed(:, end), f_fixed(end));
if g <= 1
plotPointsOverContour(x_fixed, fun, XSetLimmits(1, :), XSetLimmits(2, :), 100, point_str + ": Steepest descent $\gamma$ = " + gamma_fixed_step, "");
else
plotPointsOverContour(x_fixed, fun, [-500, 500], [-500, 500], 100, point_str + ": Steepest descent $\gamma$ = " + gamma_fixed_step, "");
end
end