log10

Date:: 10-12-2011

NAME

LOG10, ALOG10, DLOG10 - Computes the common logarithm (base 10) of x

SYNOPSIS

LOG10 ([X=]x)
ALOG10 ([X=]x)
DLOG10 ([X=]x)

IMPLEMENTATION

Cray Linux Environment (CLE)

STANDARDS

Fortran

DESCRIPTION

LOG10 is the generic function name; the others are specifics. These are elemental intrinsic functions. These functions accept the following argument:

x: Must be type single precision or double precision. See the RETURN VALUES section for information on input data types and return values.

These functions evaluate y = log10(x).

Vector versions of these intrinsics exist.

NOTES

The ALOG10 and DLOG10 intrinsic function names can be passed as arguments; the others cannot.

The following return values occur:

ALOG10(0) yields -infinity.
ALOG10(-0) yields NaN.
If -infinity <= x < 0, ALOG10(x) yields NaN.
ALOG10(infinity) yields infinity.

Note: The log10() function has a Linux-equivalent name. Use the man -aname option to show all manual pages matching name within the MANPATH search path. Manual pages are displayed in the order found.

RETURN VALUES

LOG10 returns the real logarithm of its argument. The generic function LOG10 becomes a call to ALOG10, or DLOG10 depending on the data type and kind of its argument.

ALOG10 returns the real common logarithm of its real argument.

DLOG10 returns the double-precision common logarithm of its double-precision argument.