From 9a7672135abed4f3c238905f90d154b939bd734a Mon Sep 17 00:00:00 2001
From: Timchenko Alexandr <alextim27@yandex.ru>
Date: Sun, 29 Nov 2015 23:31:20 +0300
Subject: [PATCH] Issue #42 Enhancement: function isEmpty added

---
 .../+core/@GenEllipsoid/GenEllipsoid.m        |  1 +
 .../+elltool/+core/@GenEllipsoid/isEmpty.m    | 32 +++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 products/+elltool/+core/@GenEllipsoid/isEmpty.m

diff --git a/products/+elltool/+core/@GenEllipsoid/GenEllipsoid.m b/products/+elltool/+core/@GenEllipsoid/GenEllipsoid.m
index 3c2fd220..c9a28910 100644
--- a/products/+elltool/+core/@GenEllipsoid/GenEllipsoid.m
+++ b/products/+elltool/+core/@GenEllipsoid/GenEllipsoid.m
@@ -18,6 +18,7 @@ function checkIsMe(objArr)
     methods
         outEllArr = plus(varargin)
         outEllArr = minus(varargin)
+        isPositiveArr = isEmpty(myEllArr)
         function isOk=getIsGoodDir(ellObj1,ellObj2,curDirVec)
             % Example:
             %   firstEllObj = elltool.core.GenEllipsoid([10;0], 2*eye(2));
diff --git a/products/+elltool/+core/@GenEllipsoid/isEmpty.m b/products/+elltool/+core/@GenEllipsoid/isEmpty.m
new file mode 100644
index 00000000..5e1dffe7
--- /dev/null
+++ b/products/+elltool/+core/@GenEllipsoid/isEmpty.m
@@ -0,0 +1,32 @@
+function isPositiveArr = isEmpty(myEllArr)
+%
+% ISEMPTY - checks if the GenEllipsoid object is empty.
+%
+% Input:
+%   regular:
+%       myEllArr: GenEllipsoid [nDims1,nDims2,...,nDimsN] - array of 
+%            GenEllipsoids.
+%
+% Output:
+%   isPositiveArr: logical[nDims1,nDims2,...,nDimsN], 
+%       isPositiveArr(iCount) = true - if GenEllipsoid
+%       myEllMat(iCount) is empty, false - otherwise.
+% 
+% Example:
+%   ellObj = elltool.core.GenEllipsoid();
+%   isempty(ellObj)
+% 
+%   ans =
+% 
+%        1
+%
+% $Author: Alexandr Timchenko <timchenko.alexandr@gmail.com>  
+% $Date: Dec-2015$
+% $Copyright: Moscow State University,
+%            Faculty of Computational Mathematics and Computer Science,
+%            System Analysis Department 2015 $
+%
+import elltool.conf.Properties;
+import elltool.core.GenEllipsoid;
+GenEllipsoid.checkIsMe(myEllArr);
+isPositiveArr = dimension(myEllArr)==0;
\ No newline at end of file