You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ft_warp_optim.m
    path of file: ./repos/spm/external/fieldtrip/utilities
    
    the code of the file until where you have to start completion: function [result, M] = ft_warp_optim(input, target, method)

% FT_WARP_OPTIM determine intermediate positions using warping (deformation)
% the input cloud of points is warped t
    
function "%s", using default parameters', func2str(optimfun));
end

if fb; fprintf('distance = %f\n', errorfun([0 0 0 0 0 0], pos1, pos2, 'rigidbody')); end

if isempty(method)
  ft_error('incorrect warping method specified');
end

% the warp is done in steps, starting simple and progressively getting more complex
level = find(strcmp(method, {
  'rigidbody'         % 1
  'globalrescale'     % 2
  'traditional'       % 3
  'nonlin1'           % 4
  'nonlin2'           % 5
  'nonlin3'           % 6
  'nonlin4'           % 7
  'nonlin5'           % 8
  }));

if isempty(level)
  ft_error('incorrect warping method specified');
end