function ext=lrtb2ext(lrtb)
% ext=LRTB2EXT(obj)
%
% Transforms the lrtb (left-right-top-bottom) set of coordinates of a graphics object
% into an  extent (left-bottom-width-hight).
%
% INPUT:
%
% lrtb      Coordinates
%
% OUTPUT:
% 
% ext       Extent
%
% See also FILLBOX, ALLEN1, EXT2LRTB
% 
% Last modified by fjsimons-at-alum.mit.edu, 10/06/2006

ext=[lrtb(1) lrtb(4) lrtb(2)-lrtb(1) abs(lrtb(4)-lrtb(3))];