Other Real Functions - HP -28S Manual

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