HP -28S Manual page 265

As an example, if ~DAT
is the
n
x 2 matrix
then
~COV
will contain the covariance matrix
1 :
Program
F.: C
u::
DUP
TF.:t·l
:;~lAP
l
Arguments
':l;CO\} , STO
o
PRED'.} DROP
I
ENTER
I
~
SUMS
ISTOI
Results
1 :
Comments
Begin the program.
Recall the contents of the
n
x
m
statistics matrix ~DAT.
Make a copy.
Transpose the matrix. The result
is an m x n matrix.
Multiply the matrices to produce
the m x m covariance matrix.
(Without swapping the matrices,
the product would be an
n x n
matrix.)
Store the covariance matrix in a
variable
~COv.
Make sure
~PAR
exists.
End the program.
Put the program on the stack.
Store the program as SUMS.
264 28: Programming Examples