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| author | Kaz Kylheku <kaz@kylheku.com> | 2014-07-18 06:59:26 -0700 |
|---|---|---|
| committer | Kaz Kylheku <kaz@kylheku.com> | 2014-07-18 06:59:26 -0700 |
| commit | c9977c0132b2a6a3df994dbdf58c27689658f20f (patch) | |
| tree | 72601b227e5a9868e990e41936016e59473c6979 /txr.1 | |
| parent | 50c2dbed6f823a286d40a1378626467b09363cbb (diff) | |
| download | txr-c9977c0132b2a6a3df994dbdf58c27689658f20f.tar.gz txr-c9977c0132b2a6a3df994dbdf58c27689658f20f.tar.bz2 txr-c9977c0132b2a6a3df994dbdf58c27689658f20f.zip | |
* Makefile (conftest, conftest2): Link math
library so we can test for math functions.
* arith.c (log2_init): New static function.
(log2, logtwo): New functions.
(l2): New static variable.
(arith_init): Call log2_init.
* configure (lang_flags): Switching _XOPEN_SOURCE
from 500 to 600 to reveal log2.
Adding test for log2.
* eval.c (eval_init): Register log2 intrinsic.
* lib.h (logtwo): Declared.
* txr.1: Documented log2.
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 6 |
1 files changed, 5 insertions, 1 deletions
@@ -10871,7 +10871,7 @@ functions. The <num> argument to asin and acos must be in the range -1.0 to 1.0. The atan2 function converts the rectilinear coordinates <x> and <y> to an angle in polar coordinates in the range [0, 2pi). -.SS Functions exp, log, log10 +.SS Functions exp, log, log10 and log2 .TP Syntax: @@ -10879,6 +10879,7 @@ Syntax: (exp <number>) (log <number>) (log10 <number>) + (log2 <number>) .TP Description: @@ -10892,6 +10893,9 @@ be a positive value. The log10 function calculates the base 10 logarithm of its argument, which must be a positive value. +The log2 function calculates the base 2 logarithm of its argument, which must +be a positive value. + Integer arguments are converted to floats. .SS Functions expt, sqrt, isqrt |