## Copyright (C) 2018 Jens Ahrensfeld
## 
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
## 
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
## 
## You should have received a copy of the GNU General Public License
## along with this program.  If not, see <http://www.gnu.org/licenses/>.

## -*- texinfo -*- 
## @deftypefn {Function File} {@var{retval} =} stdp_eval (@var{input1}, @var{input2})
##
## @seealso{}
## @end deftypefn

## Author: Jens Ahrensfeld <ahrensfeld@w2ess001vm>
## Created: 2018-01-17

function stdp_eval ()

N = 8;

Vp = zeros(N,1);
W = rand(N, 1)

K = 100;
alpha = 0.5;
beta = 0.5;
thresh = 2.0;
kn = 0.01;
mu = 0.01;

Vf = 0;
for k=1:K,

	Vin = rand(N,1) > 0.8;
	Vp = max(alpha*Vp, Vin);

	V = sum(W.*Vp);
	n = kn*(2.0 * (0.5 - rand()));
	fire = ((V+n) >= thresh);
	Vf = max(beta*Vf, fire);
	
	W = W + mu*Vp*Vf;
	
	
	_V(k) = V;
	_Vin(:, k) = Vin;
	_fire(k) = fire;
	
end

plot(1:K, _V, 1:K, _fire); grid;

endfunction