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bblcurve  Compute the L-curve and estimate regularization parameter.
   The L-curve method is a practical way to balance accuracy and noise.
   After using bbpresolve, bblcurve can be used to suggest a

   L=bblcurve(BB,S,type), where S is computed by bbpresolve, gives a
   suitable parameter for a regularizaion specified by type.
   See bbregsolve for a list of regularization methods.

   [L,IN]=bblcurve(...) returns a struct that includes the computed the
   L-curve. bblcurve(BB,S,type,P) evaluates the L-curve using the
   regularization-parameters given in P.

   See also bbpresolve, bbregsolve.