function n = strlength (s)
  %STRLENGTH  Number of characters in each element of text (MATLAB R2016b+).
  %
  %  An owuitools compatibility shim; see contains.m for the policy.
  %  MATLAB returns a double array shaped like its input, and 0 for the
  %  empty string. With char input it counts the characters, which is what
  %  `numel` does here - the difference only shows up for cell input.

  if (nargin < 1)
    error ('strlength: not enough input arguments');
  end
  if (ischar (s))
    n = numel (s);
    return;
  end
  c = owuitools_text_cell (s, 'strlength', 'str');
  n = zeros (size (c));
  for k = 1:numel (c)
    n(k) = numel (c{k});
  end
end