% -*- texinfo -*-
% @deftypefn {Function File} @var{r} = corr2 (@var{I},@var{J})
% Returns the correlation coefficient between @var{I} and @var{j}.
% @var{I}, @var{J} must be real type matrices or vectors of same size.
% @seealso{cov, std2}
% @end deftypefn