Subject: calculate the angle

From: [email-masked] (Pornthep Sompornpisut)
Date: Sat, 24 Feb 1996 10:46:55 +0100 (NFT)

Dear colleague,

I would like to measure an angle between two planar molecules 
containing 20 atoms per each (however, at least three atoms which
could be enough to calculate one plane). All atoms are in cartesian
coordinates (pdb format). It is not convenient to calculate manually
since I will have to repeat the measurement several times.

I will appreciate if anyone know of any programs that can measure the angle
between the planes? 

Thank in advance

Thep