function [ alpha, c1, c2, delta, gamma, t0, xmin, xmax ] = ...
  schroedinger_nonlinear_parameters ( )

%*****************************************************************************80
%
%% schroedinger_nonlinear_parameters() returns parameter values.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    12 March 2021
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Willem Hundsdorfer, Jan Verwer,
%    Numerical solution of time-dependent advection-diffusion-reaction equations,
%    Springer, 2003
%    ISBN: 978-3-662-09017-6
%
%  Input:
%
%    real ALPHA: a parameter used to define solitons in the exact solution.
%
%    real C1, C2: the speeds of the two solitons in the exact solution.
%
%    real DELTA: the separation of the two solitons at the initial time.
%
%    real GAMMA: the coefficient of the cubic term in the PDE.
%
%    real T0: the initial time.
%
%    real XMIN, XMAX: the spatial range.
%
  alpha = 0.5;
  gamma = 1.0;
  c1 = 1.0;
  c2 = 0.1;
  delta = 25.0;
  t0 = 0.0;
  xmin = -20.0;
  xmax = 80.0;

  return
end
