First test suite for ex2

ex2/test_ex2.m

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+%!test test_sanity()
+
+%!test test_sigmoid()
+

ex2/test_sanity.m

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+## Copyright (C) 2014 ebort_000
+## 
+## 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} =} test_sanity (@var{input1}, @var{input2})
+##
+## @seealso{}
+## @end deftypefn
+
+## Author: ebort_000 <ebort_000@LAMBDA>
+## Created: 2014-03-28
+
+function test_sanity ()
+  assert(1,1);
+endfunction

ex2/test_sigmoid.m

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+function test_sigmoid ()
+
+  % large positive values return close to 1.0
+  assert( sigmoid(1e20), 1.0, 1e-3);
+
+  % large negative values return close to 0.0
+  assert( sigmoid(-1e20), 0.0, 1e-3);
+
+  % sigmoid(0) gives EXACTLY 0.5
+  assert( sigmoid(0), 0.5, 1e-6);
+
+  % should work with vectors
+  % (row vector)
+  assert( sigmoid([-1e10, 0, 1e10]), [0 0.5 1], 1e-6 );
+
+  % (column vector)
+  assert( sigmoid([-1e10 0 1e10]'), [0 0.5 1]', 1e-6 );
+
+  % should work with matrices
+  % - should perform sigmoid on every element
+  assert (sigmoid([-1e10  0    +1e10 ;
+                    0     1e10 -1e10 ;
+                    1e10 -1e10  0    ]),
+          [0   0.5 1  ;
+           0.5 1   0  ;
+           1   0   0.5], 1e-6);  
+
+endfunction