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% /******************************************************************************
%
% This program, "NCDM", the associated MATLAB scripts and all
% provided data, are copyright (C) 2014 Andrew R. Cohen, All rights reserved.
%
% This program uses bzip2 compressor as a static library.
% A built version for windows 64 is included. for other platforms, see
% the files in the bzlib project on https://git-bioimage.coe.drexel.edu
%
% This software may be referenced as:
%
% A.R. Cohen, C. Bjornsson, S. Temple, G. Banker, and B. Roysam,
% "Automatic Summarization of Changes in Biological Image Sequences
% using Algorithmic Information Theory". IEEE Transactions on Pattern
% Analysis and Machine Intelligence, 2009. 31(8): p. 1386-1403.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions
% are met:
%
% 1. Redistributions of source code must retain the above copyright
% notice, this list of conditions and the following disclaimer.
%
% 2. The origin of this software must not be misrepresented; you must
% not claim that you wrote the original software. If you use this
% software in a product, an acknowledgment in the product
% documentation would be appreciated but is not required.
%
% 3. Altered source versions must be plainly marked as such, and must
% not be misrepresented as being the original software.
%
% 4. The name of the author may not be used to endorse or promote
% products derived from this software without specific prior written
% permission.
%
% THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
% OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
% WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
% DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
% DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
% GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
% WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
% SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
%
% Andrew R. Cohen acohen@coe.drexel.edu
% GapSpectral version 1.0 (release) November 2014
%
% ******************************************************************************/
% NCD
% Returns the normalized compression distance between V1,V2
% this is the pairwise NCD
function ncd = NCD(V1,V2)
n1 = Press(V1,[]);
n2 = Press(V2,[]);
nBoth = Press(V1, V2);
ncd= (nBoth-min(n1,n2))/max(n1,n2);
end