(Comp.sys.handhelds) Option: 
Item: 3447
Subj: Symbolic Matrix Utilities
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  Resp: 1 of 1 by blair at en.ecn.purdue.edu
Author: [Marc E Blair]
  Date: Thu Jun 13 1991 12:14 

This is a newer version which allows symbolics in solving simeq and also
simplifies answers further than the old program.

->Q   This program toggles fraction mode (a little block appears to indicate
      fraction mode) otherwise straight decimals will be used. Fractions can
      eat up memory on lengthy calculations.

det   returns a determinant of a matrix. It behaves much like the routine  
      Eliel Louzouen wrote a while back, although I wrote this with speed
      as first priority. The approach I used resulted in a twelvefold 
      increase in speed with numeric evaluation and a threefold increase in
      symbolic evaluation than the original routines.

simeq solves a system of equations in matrix format... i.e. 4x+5y=9 and
      3x+2y=10 would be entered { { 4 5 9 } { 3 2 10 } } and evaluated
      returning { '32/7' '-(13/7)' } meaning x=32/7 and y=-13/7.
      The program uses matrices to solve if there are less than five
      variables, >5 results in row reduction. (this way a ten variable
      equation takes 5 minutes, matrix methods would take 25 days)

rr    row reduction program to reduce matrices into row-echelon form.
      symbolic row reduction is supported.

inv   invert a matrix using row reduction techniques

mec   expand and collect and evaluate all items in a matrix to their most
      simple form
-----  All other variables are subprograms.

I am not repsonsible for memory loss, hardware trouble, loss of math abilities,
sudden shifts in the space-time continuum, or other problems which might occur
due to the use of this program but in all likelihood will never happen.

enjoy!

[Note: See also SYMBMAT on Goodies Disk #1 for another approach.  -jkh-]