OptimizationTechniques/Work 3/scripts/Script_4_SteepDesc_Proj.m

% Define environment (functions, gradients etc...)
GivenEnv

% Settings
max_iter = 1000; % Maximum iterations

% Define parameters
% =========================================================================
x0 = [8, -10]';
gamma = 0.2;
sk_step = 0.1;
tol = 0.01; % Tolerance



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);


gamma_fixed_step = gamma;
[x_fixed, f_fixed, kk] = method_SteepDesc_Proj(fun, grad_fun, x0, sk_step, XSetLimmits, 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', gamma_fixed_step, x0, kk, x_fixed(:, end), f_fixed(end));
plotPointsOverContour(x_fixed, fun, XSetLimmits(1, :), XSetLimmits(2, :), 100, point_str + ": Steepest descent $\gamma$ = " + gamma_fixed_step, "");