="2">Check that the software is installed.</h2><p>Be sure that lbfgsb is in your path.</p><pre class="codeinput">help <span class="string">lbfgsb</span>
</pre><pre class="codeoutput">  x = lbfgsb( fcn, l, u )
    uses the lbfgsb v.3.0 library (fortran files must be installed;
        see compile_mex.m ) which is the L-BFGS-B algorithm.
    The algorithm is similar to the L-BFGS quasi-Newton algorithm,
    but also handles bound constraints via an active-set type iteration.
    This version is based on the m