Line minimization of f along df
Finds minimum of f on line x0 + dx*w | a < w < b  by
bracketing. a and b are passed through argument ctl.
Arguments
-  f     : string : Name of function. Must return a real value
-  args  : cell   : Arguments passed to f or RxC    : f’s only argument. x0 must be at args{ ctl(2) }
-  ctl   : 5      : (optional) Control variables, described below.
Returned values
-  s   : 1        : Minimum is at x0 + s*dx
-  v   : 1        : Value of f at x0 + s*dx
-  nev : 1        : Number of function evaluations
Control Variables
-  ctl(1)       : Upper bound for error on s              Default=sqrt(eps)
-  ctl(2)       : Position of minimized argument in args  Default= 1
-  ctl(3)       : Maximum number of function evaluations  Default= inf
-  ctl(4)       : a                                       Default=-inf
-  ctl(5)       : b                                       Default= inf
Default values will be used if ctl is not passed or if nan values are
given.