From wscott@EN.ECN.PURDUE.EDU Tue Feb 27 15:03:22 1990
From: wscott@EN.ECN.PURDUE.EDU (Wayne H Scott)
Newsgroups: comp.sys.handhelds
Subject: Eigenvalues
Date: 25 Feb 90 17:37:37 GMT


I have always used the symbolic matrix programs to compute Eigenvalues until
today when I discovered a fast and simple way to do it using the hp28
solver.

The solver can the zero of a function or even a program if it does not take a
number off the stack and returns one number to the stack.  

Enter the following program into your HP.

<< A DUP IDN X * - DET >>

Now press STEQ and enter the solver.

A and X appear on the menus.  Enter the matrix you want to have the Eigenvalues
of and press A.  Now enter you first guess for X and press X.  Press shift X
and the solver will come up with a value.

I don't know about you people but I was very exicited when I discovered how
easily the system that already exists allows you to solver this problem.

Note: Inital test show that this is much faster than using other Eigenvalue
      programs.

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