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function v = getversion
%GETVERSION return MATLAB version number as a double.
% GETVERSION determines the MATLAB version, and returns it as a double. This
% allows simple inequality comparisons to select code variants based on ranges
% of MATLAB versions.
%
% As of MATLAB 7.10, the version numbers are listed below:
%
% MATLAB version getversion return value
% ------------------------------- -----------------------
% 7.10.0.499 (R2010a) 8.0 (this needs to be fixed).
% 7.9.0.529 (R2009b) 7.9
% 7.8.0.347 (R2009a) 7.8
% 7.7.0.xxx (R2008b) 7.7
% 7.6.0.324 (R2008a) 7.6
% 7.5.0.342 (R2007b) 7.5
% 7.4.0.287 (R2007a) 7.4
% 7.3.0.267 (R2006b) 7.3
% 7.2.0.232 (R2006a) 7.2
% 7.1.0.246 (R14) Service Pack 3 7.1
% 7.0.4.365 (R14) Service Pack 2 7.04
% 7.0.1.24704 (R14) Service Pack 1 7.01
% 6.5.2.202935 (R13) Service Pack 2 6.52
% 6.1.0.4865 (R12.1) 6.1
% ...
% 5.3.1.something (R11.1) 5.31
% 3.2 whatever 3.2
%
% Example:
%
% v = getversion ;
% if (v >= 7.0)
% this code is for MATLAB 7.x and later
% elseif (v == 6.52)
% this code is for MATLAB 6.5.2
% else
% this code is for MATLAB versions prior to 6.5.2
% end
%
% This getversion function has been tested on versions 6.1 through 7.10, but it
% should work in any MATLAB that has the functions version, sscanf, and length.
%
% MATLAB 7.10 adds a twist. It is the first subversion that is 2 digits
% ("10"). I need to decide how to handle this case. I can't return 7.1,
% of course. But returning 8.0 is also problematic.
%
% See also version, ver, verLessThan.
% Copyright 2007, Timothy A. Davis
% This function does not use ver, in the interest of speed and portability.
% "version" is a built-in that is about 100 times faster than the ver m-file.
% ver returns a struct, and structs do not exist in old versions of MATLAB.
% All 3 functions used here (version, sscanf, and length) are built-in.
v = sscanf (version, '%d.%d.%d') ;
v = 10.^(0:-1:-(length(v)-1)) * v ;
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