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HP HP-18C - How the Solver Works

HP HP-18C
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How
the
Solver Works
The
solver
has
two
ways
of
finding
an
answer. First,
the
solver tries to
find
a direct
solution
by
rearranging
the
formula
and
then
solving for
the
variable.
If
the
solver finds a direct solution,
the
HP-18C
displays
the
answer
on
the
calculator line,
and
no
other
information
is
displayed.
If
the
solver is
unable
to
find
a direct solution,
the
solver tries to find
the
answer
numerically. This involves searching for
the
answer
by
es-
timating
a set
of
answers, seeing
how
close
they
are to a solution,
and
then
making
another
set of estimates.
The
HP-18C
displays
the
cur-
rent
estimates
while
the
solver is
searching
for
an
answer
numerically.
You
should
keep in
mind
that
there may
be
more
than
one
solution
to
a
formula,
and
that
it
may
be
necessary for you to
enter
guesses in
order
to influence
which
solution
the
solver finds.
If
the
displayed
estimates
don't
appear
to
be
proceeding
towards
a
number
you
judge
to
be
a
reasonable
answer, you
may
want
to
stop
the
numerical process,
enter
your
own
guesses,
and
restart
the
search (refer to
Halting
and
Re-
starting
the
Numerical
Search,
and
Entering
Guesses
on
page
138).
Since
the
process of
finding
a
numerical
solution
is very complex,
there
are
four
possible
outcomes
that
you
should
be
aware
of.
If
nec-
essary, refer to
Solver
Calculations
on
page
171 for
additional
descriptions
of
these
possible outcomes.
•
Case
1:
The
HP
-18C displays
an
answer
on
line 3
and
there
is
no
message in lines 1
and
2.
It
is very likely
that
the
solver
has
found
a solution.
The
18-C
may
display
additional
information
if you re-
peat
the
calculation
by
pressing
the
menu
key for
the
variable you
solved
for.
If
repeating
the
calculation causes
the
HP-18C
to dis-
play
a message in lines 1
and
2,
you
can
read
portions
of
Solver
Calculations
on
page
171 to explain
the
meaning
of
the
message .
•
Case
2:
The
HP-18C
displays
an
answer
in line 3
and
automati-
cally displays a message in lines 1
and
2.
The
solver
has
found
a
possible solution,
but
you
must
use
judgement
in
interpreting
the
results. Refer to
Solver
Calculations
on
page
171 for
more
information.
9:
The
Formula
Solver
137

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