head><body><div class="background"><a href="index.html"><img area="13494" src="images/logo.gif" alt="Sandia National Laboratories" border="0" height="78" width="173"></a></div><div class="content"><h1>Poblano Toolbox for MATLAB: Nonlinear Conjugate Gradient Optimization</h1><!--introduction--><p>Nonlinear conjugate gradient (NCG) methods [3] are used to solve unconstrained nonlinear optimization problems. They are extensions of the conjugate gradient iterative method for solving linear systems adapted to so