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If the answer in line 3
seems
unreasonable, it could be because the
formula
has more than one numerical solution. You might
want
to
enter one or
two guesses and restart the
search.
If
you want
to obtain additional information about the answer,
press
and
hold down the menu key for the unknown variable until
the numbers in the display stop changing. At this point, the
solver
is displaying the final estimates and the signs of LEFT
-
RIGHT for
each estimate.
Figure B·4. Displaying the Final Estimates and Signs of
LEFT-RIGHT
CALCULATING ...
AP1: 9. 45823643359
AP1: 9. 45823643358
~1l:D)
Sign of
+
}
LEFT
-RIGHT
for
each estimate
This information can be helpful (see figure B-5):
• Case 2a: If the signs of LEFT
-
RIGHT are opposite, and the two
estimates are as close together as two 12-digit numbers can get
(neighbors), the solver found two estimates that
Hbracketed
H
an
ideal solution (a solution where LEFT - RIGHT equals 0). If LEFT
and RIGHT are relatively close together, the answer is probably a
solution.
Otherwise, the answer is probably not a
solution.
• Case 2b: If the signs of LEFT
-
RIGHT are opposite, and the two
estimates are not neighbors, you should be very cautious about
accepting the answer as a solution. If LEFT and RIGHT are rela-
tively close together, the answer is probably a
solution.
• Case 2c: If LEFT-RIGHT for the the two estimates have the
same sign, the
solver
has halted because it could find no esti-
mates that further reduced the magnitude of LEFT - RIGHT. You
should be very cautious about accepting the answer. If the values
of LEFT and RIGHT are not relatively close to one another, you
should reject the answer as a solution.
176
B: More About Hp·18C Calculations
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