Sets the absolute tolerance for x.
Equivalent in C API: nlopt_set_xtol_abs and nlopt_set_xtol_abs1
Params: tol = value of tolerance, default determined by enum defaultTol
auto opt = Opt(Algorithm.auglag, 2); double[] test = [1e-4, 1e-4]; opt.setXTolAbs(test); assert(opt.getResult() > 0);
auto opt = Opt(Algorithm.auglag, 2); opt.setXTolAbs(1e-4); assert(opt.getResult() > 0);
See Implementation
Sets the absolute tolerance for x.
Equivalent in C API: nlopt_set_xtol_abs and nlopt_set_xtol_abs1