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Multiplan stops iterating when one of three things occurs:
• You press I
SHIFT
II
PAUSE
I(I
BREAK
I).
• The conditions of a completion test you have designed are met.
Limiting Iteration
2
#1
I
R2CI
2
(2-RICI)/2
3
2
#1
I
R2CI
2 -2*RICI +3
3
To stop a diverging model, press I
SHIFT
II
PAUSE
I(I
BREAK
I). If your
answers diverge during iteration, reorder the formulas, then begin iteration
agam.
The solution to both of these models is RIC I
=
I R2C I
=
I. The first
model, however, will diverge during iteration.
As a general guideline, put all circular references in a single column in
order to keep track of the order of evaluation. Also, in some situations, the
order of calculation can cause your model to "diverge" instead of converge.
• The amount of change between iterations is less than 0.00 I (unless you
have set your own completion test).
To keep Multiplan from iterating endlessly when a model diverges, or to
change the degree of accuracy (from 0.00 I), you can set a completion test.
Completion Tests
)
)
)
)
1
)
,
)1
)
)
)
)
)
}
)
)
)
)
)
)
)
)
J
)
)
»
)
)
j
A completion test is a logical expression that returns either TRUE or
FALSE. Multiplan checks the expression before beginning each iteration.
If the expression is TRUE, iteration stops. If the expression is FALSE,
another iteration is performed.
Multiplan uses DELTA ( )
<
0.00 I ifno other completion test is entered.
This expression is FALSE if any cell changes by more than 0.00 I. It is
TRUE when no cell changes by more than 0.001.
You can set up completion tests, using one ofthese three conditions:
• The built-in ITERCNT operation, which defines the maximum number
of iterations.
185
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