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In extending the Levenberg-Marquardt      L 2 {L_2}       method for nonlinear curve-fitting to the      L 1 {L_1}       and      L ∞  {L_\infty }       norms, the following problems arise, but are dealt with successfully: (1) Trial parameters are generated by linear programming, which can be time-consuming. (2) Trial parameters are not uniquely specified in some cases. (3) There are intervals of the search parameter for which the trial parameters remain constant. (4) In      L 1 {L_1}      , the trial parameters are discontinuous with respect to the search parameter. It is shown that linear constraints on the parameters are easily included in the computations. Finally, some numerical results are presented.

Nonlinear curve-fitting in the 𝐿₁ and 𝐿_{∞} norms