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Programming Techniques 13–23
&
& !- L
& %1
1
L2
2
If i holds: Then XEQ(i) calls: To:
1 LBL A Compute
y
ˆ
for straight–line model.
2 LBL B Compute
y
ˆ
for logarithmic model.
3 LBL C Compute
y
ˆ
for exponential model.
4 LBL D Compute
y
ˆ
for power model.
7 LBL G Compute
x
ˆ
for straight–line model.
8 LBL H Compute
x
ˆ
for logarithmic model.
9 LBL I Compute
x
ˆ
for exponential model.
10 LBL J Compute
x
ˆ
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
1
L2
2
and
!1
1
L2
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.