function d = mydtf(n,a)
%MYDTF Example custom transfer derivative function of MYTF.
%
%	Use this function as a template to write your own function.
%	
%	Syntax
%
%	  dA_dN = mydtf(N,A)
%	    N - SxQ matrix of Q net input (column) vectors.
%	    A - SxQ matrix of Q output (column) vectors.
%	    dA_dN - SxQ derivative dA/dN.
%
%	Example
%
%	  n = -5:.1:5;
%	  a = mytf(n);
%	  da_dn = mydtf(n,a);
%	  subplot(2,1,1), plot(n,a)
%	  subplot(2,1,2), plot(n,da_dn)
% $Revision: 1.1 $

% **  Replace the following calculation with your
% **  derivative calculation.

d = -8*n.^7.*a.^2;

% **  Note that you have both the transfer functions input N and
% **  output A available, which can often allow a more efficient
% **  calculation of the derivative than with just N.
