function [v, idx] = maxk (x, k, varargin)
  %MAXK  The k largest elements, in descending order (MATLAB R2017b+).
  %
  %  An owuitools compatibility shim; see contains.m for the policy.
  %  Column-wise for a matrix, like MATLAB and like `sort`. NaNs go last,
  %  which is also what MATLAB does. `k` larger than the data returns
  %  everything there is rather than erroring, again matching MATLAB.

  if (nargin < 2)
    error ('maxk: not enough input arguments');
  end
  [v, idx] = owuitools_topk (x, k, 'descend', 'maxk', varargin{:});
end