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## -*- texinfo -*-
## @deftypefn  {} {} range (@var{x})
## @deftypefnx {} {} range (@var{x}, @var{dim})
## Return the range, i.e., the difference between the maximum and the minimum
## of the input data.
##
## If @var{x} is a vector, the range is calculated over the elements of
## @var{x}.  If @var{x} is a matrix, the range is calculated over each column
## of @var{x}.
##
## If the optional argument @var{dim} is given, operate along this dimension.
##
## The range is a quickly computed measure of the dispersion of a data set, but
## is less accurate than @code{iqr} if there are outlying data points.
## @seealso{bounds, iqr, mad, std}
## @end deftypefn

function y = range (x, dim)

  if (nargin < 1)
    print_usage ();
  endif

  if (nargin == 1)
    y = max (x) - min (x);
  else
    y = max (x, [], dim) - min (x, [], dim);
  endif

endfunction


%!assert (range (1:10), 9)
%!assert (range (single (1:10)), single (9))
%!assert (range (magic (3)), [5, 8, 5])
%!assert (range (magic (3), 2), [7; 4; 7])
%!assert (range (2), 0)

## Test input validation
%!error <Invalid call> range ()
