% Numerical Mathematics and Computing, Fifth Edition
% Ward Cheney & David Kincaid
% Brooks/Cole Publ. Co.
% (c) 2004
%
% file: pdexlbc.m
% 
% PDE: boundary conditions
%
function [pl, ql, pr, qr]= pdexlbc(ul,ul,xr,ur,t)
     pl = ul;
     ql = 0;
     pr = ur;
     qr =0;