Operations, Commands,
and Functions
17
Each procedure built into
the
HP-28S can
be
classified as
an
opera-
tion, a command, a function, or
an
analytic function.
• An
operation
is
any
procedure built into
the
calculator.
• A
command
is a programmable operation.
• A
function is a
command
allowed in algebraics.
• An
analytic function is a function for
which
the
HP-28S provides a
derivative
and
inverse.
Built-in procedures are usually characterized
by
their highest capabil-
ity.
For example, SWAP
and
IP are
both
commands,
but
we
characterize SWAP as a
command
and
IP as a function. The following
table
shows
examples
of
each type.
Operations
Commands
Non-Programmable
Operations
RPN
Functions
Commands
Non-Analytic
Analytic
[ill[]
SWAP
ABS
ASIN
I NEXT I
DROP
a
EXP
.IEDITI
LAST
IP
INV
.1
VIEWt
I
RCL
MAX
LN
I
ENTER
I
PURGE
OR
NEG
I
EEX
I
J
%CH
SIN
.1
COMMAND I
STO
R-D
SINH
.1
UNDO
I
EVAL
R-P
sa
.1
CONTI
CLEAR
XPON
+
IONI
CONVERT
'*
=
164
17:
Operations,
Commands,
and
Functions
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