function J=GetJacobian(beamelem,z_list,gauss_coord)
%GETJACOBIAN - computes the jacobian for a beamelem
%
%   Usage:
%      J=GetJacobian(beamelem,z_list,gauss_coord)
%
%   See also GETJACOBIANDETERMINANT, GETJACOBIANINVERT

%The Jacobian is constant over the element, discard the gaussian points. 
J=1/2*(z_list(2)-z_list(1));
