function retval = gfcn(x,t)
% usage: retval = gfcn(x,t)
% description: This function accepts input vector x and scalar
% to compute the function g(x,t) for general diffusion equation.
% Useful for compensation due to known soln to diffusion eqn.

% programmer: t. shores
% last update: 2/16/16
 
% Octave and Matlab compatible file
retval = zeros(size(x));
