HP 33s - Manual (Page 207)

Programming Techniques 13–23
&
&
! - L
&
% 1
1L2 2
If i holds: Then XEQ(i) calls: To:
1 LBL A Compute
yˆ
for straight–line model.
2 LBL B Compute
yˆ
for logarithmic model.
3 LBL C Compute
yˆ
for exponential model.
4 LBL D Compute
yˆ
for power model.
7 LBL G Compute xˆ for straight–line model.
8 LBL H Compute xˆ for logarithmic model.
9 LBL I Compute xˆ for exponential model.
10 LBL J Compute xˆ for power model.
Example: Loop Control With (i).
An index value in i is used by the program "Solutions of Simultaneous Equations —
Matrix Inversion Method" in chapter 15. This program uses the looping
instructions   L and   L in conjunction with the indirect instructions
1
1L2 2 and ! 1 1L2 2 to fill and manipulate a matrix.
The first part of this program is routine A, which stores the initial loop–control
number in i.
Program lines:
(In RPN mode)
Description:

   The starting point for data input.

 )
 Loop–control number: loop from 1 to 12 in intervals of 1.

 ! L Stores loop–control number in i.
The next routine is L, a loop to collect all 12 known values for a 3 × 3 coefficient
matrix (variables A – I ) and the three constants ( J – L ) for the equations.