66 Function Keys
In
working through
complex
equations
, like the
one
containing
six
levels
of
parentheses
above
, you really
appreciate
the value
of
the Hewlett-
Packard
logic system. Because you calculate
one
step
at a time, you
don't
get
"lost
" within the problem.
You
see
every
intermediate result, and you emerge from
the
calcula-
tionconfidentofyourfin~answer.
Statistical Functions
Summations
Pressing the m key automatically gives you several different
sums
and
products
of
the
values
in
the X- and Y- registers at
once.
In
order
to make these values accessible for sophisticated
statistics
problems,
they
are automatically placed by the calcu-
lator
into storage registers
R3
through R
7
•
The
only time
that
information is
automatically
accumulated
in
the storage reg-
isters is when the
m key is used. Before you begin any calcu-
lations using the
m key, you should first
clear
the storage
registers
of
data
by pressing
D.
When
you key a
number
into the display and
press
the
m key,
each
of
the
following
operations
is
performed:
The
number
that
you
keyed
into the X-register is added
to the
contents
of
storage register R
7
•
The
square
of
the
number
that
you keyed into the X-
register
is
added
to the
contents
of
storage register
R,;.
The
number that you keyed into the X-register
is
multiplied
by
the
contents
of
the Y-register,
and
the
product
added
to
storage register R
5
.
The
number
in
the
Y-register
of
the
stack
is
added
to the
contents
of
storage register R
4
•
The
number
1
is
added
to storage register R
3
,
and the total
number
in
R,;
is
then written into the display
(The
stack
does
not
lift).
Thus,
each
press
of
the
m key updates these
summations
and
multiplications.
The
contents
of
the displayed X-register
and
the applicable storage registers
are
as follows:
Register Data
Displayed X n
n
Number
of
entries.
Number
of
entries.
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