$ZLOG (ObjectScript)
Returns the base–10 logarithm value of the specified positive numeric expression.
Synopsis
$ZLOG(n)
Argument
| Argument | Description |
|---|---|
| n | Any positive, nonzero number, which can be specified as a value, a variable, or an expression. |
Description
$ZLOG returns the base–10 logarithm value of n.
Specifying zero or a negative number results in an <ILLEGAL VALUE> error.
A non-numeric string is evaluated as 0 and therefore results in an <ILLEGAL VALUE> error. For evaluation of mixed numeric strings and non-numeric strings, refer to Strings As Numbers.
The corresponding natural log (base e) function is $ZLN.
Examples
The following example writes the base 10 logarithms of the integers 1 through 10:
FOR x=1:1:10 {
WRITE !,"The log of ",x," = ",$ZLOG(x)
}
QUITreturns:
The log of 1 = 0
The log of 2 = .301029995663981195
The log of 3 = .477121254719662437
The log of 4 = .60205999132796239
The log of 5 = .698970004336018805
The log of 6 = .778151250383643633
The log of 7 = .845098040014256831
The log of 8 = .903089986991943586
The log of 9 = .954242509439324875
The log of 10 = 1
WRITE $ZLOG($ZPI)returns .4971498726941338541.
WRITE $ZLOG(.5)returns -.301029995663981195.
WRITE $ZLOG(0)issues an <ILLEGAL VALUE> error.
