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:
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Hp·18C
Calculations
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