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/usr/share/octave/site/m/nlopt/NLOPT_LN_COBYLA.m is in octave-nlopt 2.4.2+dfsg-2.

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% NLOPT_LN_COBYLA: COBYLA (Constrained Optimization BY Linear Approximations) (local, no-derivative)
%
% See nlopt_minimize for more information.
function val = NLOPT_LN_COBYLA
  val = 25;