Name
log, log2, log1p, logb — logarithm functions
Synopsis
log(
|
in x double precision); |
log2(
|
in x double precision); |
log1p(
|
in x double precision); |
logb(
|
in x double precision); |
Description
These functions work with double precision floating point numbers. They
convert their argument to an IEEE 64-bit float and return a result of that
type. See also log10.
: log natural logarithm (base e) of x.
: log2 base-2 logarithm of x.
: log1p natural logarithm of (1 + x), computed accurately for very small x.
: logb extracts the exponent of x as a signed integer value in floating-point format.
Parameters
x
double precision
Return Values
log.
Examples
Example 24.224. Simple Examples
SQL> select concat ('the LOG of 0.513513 is: ', cast (log (0.513513) as varchar));
callret
VARCHAR
_______________________________________________________________________________
the LOG of 0.513513 is: -0.666480
1 Rows. -- 4 msec.