Gets the relative tolerance for x.
Equivalent in C API: nlopt_get_xtol_rel
XTolRel
auto opt = Opt(Algorithm.auglag, 2); opt.setXTolRel(1e-4); assert(opt.getXTolRel() == 1e-4);
See Implementation
Gets the relative tolerance for x.
Equivalent in C API: nlopt_get_xtol_rel