Manpage of LOG
LOG
Section: NEWLIB (3)
Updated: 2005 Feb 23
Index
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NAME
1.21 `log', `logf'--natural logarithms
SYNOPSIS
#include <math.h>
double log(double X);
float logf(float X);
DESCRIPTION
Return the natural logarithm of X, that is, its logarithm base e (where
e is the base of the natural system of logarithms, 2.71828...). `log'
and `logf' are identical save for the return and argument types.
You can use the (non-ANSI) function `matherr' to specify error
handling for these functions.
RETURNS
Normally, returns the calculated value. When X is zero, the returned
value is `-HUGE_VAL' and `errno' is set to `ERANGE'. When X is
negative, the returned value is `-HUGE_VAL' and `errno' is set to
`EDOM'. You can control the error behavior via `matherr'.
PORTABILITY
`log' is ANSI, `logf' is an extension.
SEE ALSO
log
is part of the
libm
library.
The full documentation for
libm
is maintained as a Texinfo manual. If
info
and
libm
are properly installed at your site, the command
-
info libm
will give you access to the complete manual.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURNS
-
- PORTABILITY
-
- SEE ALSO
-
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