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Specific
Features
of the
HP-33E
19
Keystrokes
OJILSTxl
Display
123.4560
0.4560
Summons
the original
number
back
to
Ihe
X-register.
Only the
fraclional
portion
of
Ihe number
is
displayed,
rounded here
1
0
FlX
4
di
splay.
When
ffjlFRACI
is
pressed,
Ihe
inleger portion
of the
number
is lost.
The
entire number
, of course,
is preserved
in
the
LAST X register
.
Statistical Functions
Accu mulations
Execuling the
~
(summa/ioll)
funct
ion
automatically
gives
you several
differenl
sums
and
products of
the
val ues
in
the
X-
and Y-regislers
at
once.
In
order to make
these values accessible
for
sophisticated
statistics
problems,
Ihey
are
automati
cally placed
by
the ca
lculator into
storage
registers.
Before
you
begin any
calculati
ons usi ng
the
~
key, you should first
clear
the storage
registers
used in
accumulations
by
executing the
OJ
CLEAR
]REG]
(clear
registers)
fun ction
.
When
you key
numbers into
the X- and
Y
-registers
and
press
the
(0
key,
the
calculator performs the
followi
ng
operations
in the
indicated regis-
ters:
Register
Displayed
X
R,
R,
A,
A
,
R.
A
,
Operation
n
n
lx
lx'
ly
ly'
lxy
Data
Number
of
(x, y) entries.
Number
of (x,
y) entries.
Summation of
x values.
Summation of
xl! values.
Summation
of
y
values.
Summation of
'I
values.
Summation
of
products
of
x and y values.
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