% -*- texinfo -*-
% @deftypefn {Function File} {[@var{RT},@var{xp}] =} radon(@var{I}, @var{theta})
% @deftypefnx {Function File} {[@var{RT},@var{xp}] =} radon(@var{I})
%
% Calculates the 2D-Radon transform of the matrix @var{I} at angles given in
% @var{theta}. To each element of @var{theta} corresponds a column in @var{RT}.
% The variable @var{xp} represents the x-axis of the rotated coordinate.
% If @var{theta} is not defined, then 0:179 is assumed.
% @end deftypefn