_3^2)\leq 0$$
%
% $$2x_1+6x_2+4x_3-24 = 0$$
%
% The corresponding object |penm| is defined by function |ex1_define|
% listed below and contained, together with the call back functions, in
% directory |examples|
%
function [penm] = ex1_define()
  penm = [];
  penm.probname = 'examples/ex1';
  penm.comment = 'Source: user external definition of functions';

  penm.Nx = 3;
  penm.lbx = zeros(3,1);  

  penm.NgNLN = 1;
  penm.NgLIN = 1;
  penm.lbg = [4, 24];  
  penm.ubg = [Inf, 24];

  pen