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From: "John D'Errico" <woodchips@rochester.rr.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Common tangent
Date: Tue, 27 Nov 2007 22:53:48 +0000 (UTC)
Organization: John D'Errico (1-3LEW5R)
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"Giuseppe Brunello" <gbrunello3@gatech.edu> wrote in message 
<fihu0m$quf$1@fred.mathworks.com>...
> I want to find between two functions f and g their common
> tangent(s). Is there a built in MatLab command that will
> take two vectors (calculated from f and g) and return the
> common tangent(s)?

No. Its something that you would have to write.
Remember that there will not be an exactly
common tangent if you are providing a list of
points from each function. So you will need to
find a the best possible line.

John