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GeoB
ASIC
Reference Manual 5.Standard Functions
TPS1100-Version 1.30 5-19
e is the exponential constant (base of natural logarithms), with
numerical value e = e
1
= Exp(1) = 2.71828
…
Note Exp is the inverse function of the Log function and is
sometimes referred to as the antilogarithm.
See Also
Log
,
Example The example uses
Exp
to compute the value of e.
Exp(1)
is e
raised to the power of 1.
' Exp(x) is e ^x so Exp(1) is e ^1 or e.
DIM dValueOfE AS Double
' Declare variables.
dValueOfE = Exp(1) ' Calculate value of e.
WRITE "The value of e is " + Str$(dValueOfE)
5.5.6 Log Function
Description Returns the natural logarithm of a number.
Declaration
Log( dNumber AS Double ) AS Double
Remarks The argument
dNumber
can be any valid numeric expression that
denotes a value greater than zero. The return type of Log function
is
Double
.
The natural logarithm is the logarithm to the base e. e is the
exponential constant (base of natural logarithms), with numerical
value e = 2.71828
…
You can calculate base-n logarithms (logarithms to the base n) for
any number x by dividing the natural logarithm of x by the natural
logarithm of n as follows:
Log
n
(x) = Log(x) / Log(n)
It holds that n x
Log x
n
( )
=
.
The following example illustrates a function that calculates base-
10 logarithms: