How about this?
SAMPLE OCTAVE INPUT FILE:
#!/usr/bin/octave -q
diary matrix1.txt
%matrix1.m      MrG     2009.0527
%purpose:   practice with matrix arithmetic

%initialize 2 matrices of dimension 2x2
a=[1 5;-1 2]
b=[-2 1;1 1]

%matrix sums
c=a+b
d=b-a

%matrix products
e=a*b
f=b*a
g=a**2
h=b**3

%matrix inverses
i=a**(-1)
j=b**(-1)

%matrix determinants
k=det(a)
l=det(b)

SAMPLE OCTAVE OUTPUT FILE:
a =

   1   5
  -1   2

b =

  -2   1
   1   1

c =

  -1   6
   0   3

d =

  -3  -4
   2  -1

e =

   3   6
   4   1

f =

  -3  -8
   0   7

g =

   -4   15
   -3   -1

h =

  -11    4
    4    1

i =

   0.28571  -0.71429
   0.14286   0.14286

j =

  -0.33333   0.33333
   0.33333   0.66667

k =  7
l = -3


HTH,
A. Jorge Garcia
http://calcpage.tripod.com

Teacher & Professor
Applied Mathematics, Physics & Computer Science
Baldwin Senior High School & Nassau Community College


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