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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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