Hi,

        I am re-sending this message because I received a message saying
that it was rejected the first time.  This is a second try.

Martin Kirk
Arizona State University
mlk@asu.edu
(602) 582-5718

---------- Forwarded message ----------
Date: Wed, 25 Oct 1995 12:45:30 -0700 (MST)
From: mlk4042@imap2.asu.edu
To: PICLIST <piclist@mitvma.mit.edu>
Subject: PIC Vector Math

Hi,

        I want to do some simple vector math in a 16C57 and I am asking
for suggestions to make the computations easy for the PIC.  For instance,
I would like to normalize a vector as follows:

        X = x(1)*i + x(2)*j

                         x(1)*i                  x(2)*j
        X(norm) = --------------------- + ---------------------
                  sqrt[x(1)^2 + x(2)^2]   sqrt[x(1)^2 + x(2)^2]

That is to say that I normalize by dividing each vector component by the
magnitude of the original vector.

        What I need here is either a good approach to doing the square
root function on a pic or some other approximation for finding vector
magnitudes which is efficiently calculated.

How about it picmasters?

Martin Kirk
Arizona State University
mlk@asu.edu
(602) 582-5718