From b160d23c68e2e8fcd82b96fab0977be11c2b9ec6 Mon Sep 17 00:00:00 2001 From: akr Date: Sat, 9 Feb 2008 09:36:03 +0000 Subject: * math.c (math_cbrt): new method Math.cbrt. * 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 --- ChangeLog | 8 ++++++++ configure.in | 2 +- math.c | 15 +++++++++++++++ missing/cbrt.c | 10 ++++++++++ 4 files changed, 34 insertions(+), 1 deletion(-) create mode 100644 missing/cbrt.c diff --git a/ChangeLog b/ChangeLog index 51502c9686..2d2375f762 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +Sat Feb 9 18:34:45 2008 Tanaka Akira + + * 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 * ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): use strtod() for more diff --git a/configure.in b/configure.in index 28e85f39ec..0ede6e4d4b 100644 --- a/configure.in +++ b/configure.in @@ -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\ diff --git a/math.c b/math.c index fd10e97008..1f78d98a55 100644 --- a/math.c +++ b/math.c @@ -400,6 +400,20 @@ math_sqrt(VALUE obj, VALUE x) return DOUBLE2NUM(d); } +/* + * call-seq: + * Math.cbrt(numeric) => float + * + * Returns the cube root of numeric. + */ + +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); diff --git a/missing/cbrt.c b/missing/cbrt.c new file mode 100644 index 0000000000..54db2703a0 --- /dev/null +++ b/missing/cbrt.c @@ -0,0 +1,10 @@ +#include + +double cbrt(double x) +{ + if (x < 0) + return -pow(-x, 1/3.0); + else + return pow(x, 1/3.0); +} + -- cgit v1.2.3