vercmp

Compares two version numbers.

Description

I use it to compare version numbers of data stored by different versions of my software for compatibility reasons.

function result = vercmp(ver1, varargin)
% Compares two version numbers.
%
% Example: 7.4.0.287
% major release.minor release.patch level.build
% Everything except the major release is optional.
%
% Arguments:
% ver1 - Version number one
% ver2 - Version number two; default: version cmd output
%
% Return values:
% result - Index of part which differs:
% 0 if equal
% > 0 if ver1 > ver2
% < 0 if ver1 < ver2
% NaN if ver1 | ver2 are not a version number
%
% Author: Johannes Kissel
% Last modified: 29.01.2008

• MATLAB release: MATLAB 7.4 (R2007a)

[Duane Hanselman]

If you are running matlab only one version number exists, so where do you get the second version number for your input argument? What about the built in function "verLessThan" in R2007a (ver. 7.4)?

[Thomas Pieper]

Duane,

I think you didn't get the point. vercmp.m is a tool which compares two version numbers produced by ANY software. Comparing Matlab version numbers is a different kettle of fish.

Thomas

[Johannes Kissel]

That's right.

Another benefit are the detailed informations about the part of the version numbers which differs.

An Example:
If ver1 is smaller than ver2 in minor release the result is -2

OK, for normal Applications it may suffice to know, if the result is 0 or not ;-)

[Arthur]

I was looking for something like this. thanks.