P  
print [Lbfgs] 
Control of the frequency at which information is outputted.

S  
state [Lbfgs] 
Holds informations on the current state of the computation that
can help to decide whether to stop.

V  
vec [Lbfgs.C] 
Vectors indexed by
0 .. n1 .

vec [Lbfgs.F] 
Vectors.

W  
work [Lbfgs] 
Represent the memory space needed to solve a minimization problem.
