HP 33s Scientific manual If i holds Then XEQi calls, Program lines, - L & % 1L2

&

& !- L & %1L2

If i holds: Then XEQ(i) calls: To:

1	LBL A	Compute	ˆ	for straight–line model.
			y
2	LBL B	Compute	ˆ	for logarithmic model.
			y
3	LBL C	Compute	ˆ	for exponential model.
			y
4	LBL D	Compute	ˆ	for power model.
			y
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 1L2 and !1L2 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:	Description:
(In RPN mode)

  

 )

 ! L

The starting point for data input.

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

Programming Techniques 13–23