HP 33s User Manual

Page 235

Mathematics

Programs

15–13

Program Listing:

Program Lines:

(In RPN mode)

Description

Starting point for input of coefficients.

)

Loop–control value: loops from 1 to 12, one at a
time.

! L

Stores control value in index variable.

Checksum and length: 35E7 21

Starts the input loop.

"!1

1L2

Prompts for and stores the variable addressed by i.

Adds one to i.

If i is less than 13, goes back to LBL L and gets the
next value.

Returns to LBL A to review values.

Checksum and length: 51AB 15

This routine inverts a 3

× 3 matrix.

Calculates determinant and saves value for the
division loop, J.

! $

! %

Calculates E'

× determinant = AI – CG.

! &

Calculates F'

× determinant = CD – AF.