% -*- texinfo -*-
% @deftypefn {Function File} {} exponential_rnd (@var{lambda}, @var{r}, @var{c})
% @deftypefnx {Function File} {} exponential_rnd (@var{lambda}, @var{sz})
% Return an @var{r} by @var{c} matrix of random samples from the
% exponential distribution with parameter @var{lambda}, which must be a
% scalar or of size @var{r} by @var{c}. Or if @var{sz} is a vector,
% create a matrix of size @var{sz}.
%
% If @var{r} and @var{c} are omitted, the size of the result matrix is
% the size of @var{lambda}.
% @end deftypefn