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* math.c (math_cbrt): new method Math.cbrt.

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* configure.in (cbrt): check for replacement functions.

* missing/cbrt.c: new file.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15416 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2008-02-09 09:36:03 +00:00
parent a424741c8e
commit b160d23c68
4 changed files with 34 additions and 1 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
Sat Feb 9 18:34:45 2008 Tanaka Akira <akr@fsij.org>
* math.c (math_cbrt): new method Math.cbrt.
* configure.in (cbrt): check for replacement functions.
* missing/cbrt.c: new file.
Sat Feb 9 17:51:24 2008 Nobuyoshi Nakada <nobu@ruby-lang.org>
* ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): use strtod() for more

2
configure.in
View file

@ -649,7 +649,7 @@ esac
AC_FUNC_MEMCMP
AC_REPLACE_FUNCS(dup2 memmove strerror strftime\
strchr strstr crypt flock vsnprintf\
isnan finite isinf hypot acosh erf tgamma lgamma_r \
isnan finite isinf hypot acosh erf tgamma lgamma_r cbrt \
strlcpy strlcat)
AC_CHECK_FUNCS(fmod killpg wait4 waitpid fork spawnv syscall chroot fsync getcwd eaccess\
truncate chsize times utimes utimensat fcntl lockf lstat\

15
math.c
View file

@ -400,6 +400,20 @@ math_sqrt(VALUE obj, VALUE x)
return DOUBLE2NUM(d);
}
/*
* call-seq:
* Math.cbrt(numeric) => float
*
* Returns the cube root of <i>numeric</i>.
*/
static VALUE
math_cbrt(VALUE obj, VALUE x)
{
Need_Float(x);
return DOUBLE2NUM(cbrt(RFLOAT_VALUE(x)));
}
/*
* call-seq:
* Math.frexp(numeric) => [ fraction, exponent ]
@ -611,6 +625,7 @@ Init_Math(void)
rb_define_module_function(rb_mMath, "log2", math_log2, 1);
rb_define_module_function(rb_mMath, "log10", math_log10, 1);
rb_define_module_function(rb_mMath, "sqrt", math_sqrt, 1);
rb_define_module_function(rb_mMath, "cbrt", math_cbrt, 1);
rb_define_module_function(rb_mMath, "frexp", math_frexp, 1);
rb_define_module_function(rb_mMath, "ldexp", math_ldexp, 2);

10
missing/cbrt.c Normal file
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@ -0,0 +1,10 @@
#include <math.h>
double cbrt(double x)
{
if (x < 0)
return -pow(-x, 1/3.0);
else
return pow(x, 1/3.0);
}