s:
 
        opts.x0     The starting value (default: all zeros)
        opts.m      Number of limited-memory vectors to use in the algorithm
                        Try 3 &lt;= m &lt;= 20. (default: 5 )
        opts.factr  Tolerance setting (see this source code for more info)
                        (default: 1e7 ). This is later multiplied by machine epsilon
        opts.pgtol  Another tolerance setting, relating to norm(gradient,Inf)
                        (default: 1e-5)
        opts.maxIts         Ho