The functions LOG
(common
logarithm)
and
ALOG
(common
antiloga-
rithm)
compute
logarithms
and
exponentials to base 10. The functions
LN (natural logarithm)
and
EXP
(natural exponential) calculate loga-
rithms
and
exponentials to base
e.
(e
is a transcendental
number
approximately equal to 2.71828182846.)
For
an
argument
x,
the
function LNP1
(In
plus
1)
computes In
(x
+ 1),
and
the
function EXPM
(exp
minus
1)
computes (exp
x)
-
1.
For argu-
ments
close to 0, each
of
these functions provides greater accuracy
than
the
corresponding sequence
of
functions. (An example using
LNP1 appears
in
"Time Value
of
Money"
on
page 103.)
Display
the
second
row
of
the
LOGS menu.
~----~-=~~~~~==~=
INEXTI
3:
-2.a6761537357E-1g
2:
0::1
1: 2.46855131361379
1iIl:c:Jrm:In1Bill1:iBXl!mm:cJ1lIllC1l1
These are
the
hyperbolic functions
and
their inverses:
SINH
(hyper-
bolic
sine)
and
ASINH
(inverse
hyperbolic
sine),
COSH
(hyperbolic
cosine)
and
ACOSH
(inverse hyperbolic
cosine),
and
TANH
(hyperbolic
tangent)
and
ATANH (inverse hyperbolic tangent). These functions are
derived from
eX,
the
natural
exponential function. All are
one-number
functions
that
act
on
the
number
in
level
1.
Other Real Functions
The
REAL
menu
contains functions
that
apply primarily to real
numbers.
Select
the
REAL
menu
.
• 1
REAL
1
3:
-2.a6761537357E-13
2:
a
1: 2.46855131361379
ICIDImIIDmIIIDHlEllUlomm
The function NEG
(negate)
returns
-x
for
an
argument
x.
The func-
tion FACT
(factorial)
returns
n!
for a positive integer n
or
the
gamma
function
f(x
+ 1) for a non-integer
argument
x. The
command
RAND
(random
number)
returns
a
random
number
calculated from a
seed specified
by
RDZ
(randomize).
78
5:
Real-Number
Functions
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