[ruby-list:37516] Re: Math.erf, Math.erfc

西松です.

田中さん> これのことでしょうか? 拡張ライブラリですけど。
田中さん> ftp://ftp.ruby-lang.org/pub/ruby/contrib/extmath0.1.tar.gz

それです, それです.
% ruby --version
ruby 1.6.8 (2002-12-24) [i686-linux]
で, 次のようにしてインストールしたら動くようになりました.
ありがとうございました.

% tar zxvf extmath0.1.tar.gz 
% cd ext/extmath/
% patch < extmath-t-nissie-01.patch （下に添付しました quick hack なパッチです.）
% ruby -rmkmf extconf.rb
% make
% su
# make install

--- 例 -------------------------------
#!/usr/bin/env ruby
require 'extmath'
p Math.sin(1.0) * Math.sin(1.0)
p Math.cos(1)   * Math.cos(1)
p ExtMath.erf(0.5)
p ExtMath.erfc(0.5)
p ExtMath.erf(1)
p ExtMath.erfc(1)
include ExtMath
p erf(1.5)
p erfc(1.5)
p erf(2)
p erfc(2)
p erf("2.1")
p erfc("2.1")
--------------------------------------

--- extmath-t-nissie-01.patch start -----------------------------------
--- extmath.c.orig	Fri Apr  4 03:21:53 2003
+++ extmath.c	Fri Apr  4 03:56:25 2003
@@ -16,14 +16,11 @@
 
 /* these declarations are stolen from math.c */
 
-VALUE float_new();
-VALUE f_float();
-
 #define Need_Float(x) \
 if (FIXNUM_P(x)) {\
-    (x) = (struct RFloat*)float_new((double)FIX2INT(x));\
+    (x) = (struct RFloat*)rb_float_new((double)FIX2INT(x));\
 } else {\
-    (x) = (struct RFloat*)f_float(x, x);\
+    (x) = (struct RFloat*)rb_Float((VALUE)x);\
 }
 
 #define Need_Float2(x,y) {\
@@ -36,26 +33,23 @@
 #define NEWMATH1(rubyname,cname) \
 static VALUE rubyname(VALUE obj, struct RFloat *x) {\
     Need_Float(x);\
-    return float_new(cname(x->value));\
+    return rb_float_new(cname(x->value));\
 }
 
 #define NEWMATH2FF(rubyname,cname) \
 static VALUE rubyname(VALUE obj, struct RFloat *x, struct RFloat *y) {\
     Need_Float2(x,y);\
-    return float_new(cname(x->value,y->value));\
+    return rb_float_new(cname(x->value,y->value));\
 }
 
 #define NEWMATH2IF(rubyname,cname) \
 static VALUE rubyname(VALUE obj, VALUE x, struct RFloat *y) {\
     Need_Float(y);\
-    return float_new(cname(NUM2INT(x),y->value));\
+    return rb_float_new(cname(NUM2INT(x),y->value));\
 }
 
 
 NEWMATH1(extm_lgamma,lgamma)
-NEWMATH1(extm_asin,asin)
-NEWMATH1(extm_acos,acos)
-NEWMATH1(extm_atan,atan)
 NEWMATH1(extm_sinh,sinh)
 NEWMATH1(extm_cosh,cosh)
 NEWMATH1(extm_tanh,tanh)
@@ -85,29 +79,26 @@
     mExtMath = rb_define_module("ExtMath");
 
     /* methods */
-    rb_define_method(mExtMath,"lgamma",extm_lgamma,1);
-    rb_define_method(mExtMath,"asin",extm_asin,1);
-    rb_define_method(mExtMath,"acos",extm_acos,1);
-    rb_define_method(mExtMath,"atan",extm_atan,1);
-    rb_define_method(mExtMath,"sinh",extm_sinh,1);
-    rb_define_method(mExtMath,"cosh",extm_cosh,1);
-    rb_define_method(mExtMath,"tanh",extm_tanh,1);
-    rb_define_method(mExtMath,"asinh",extm_asinh,1);
-    rb_define_method(mExtMath,"acosh",extm_acosh,1);
-    rb_define_method(mExtMath,"atanh",extm_atanh,1);
-    rb_define_method(mExtMath,"ceil",extm_ceil,1);
-    rb_define_method(mExtMath,"floor",extm_floor,1);
-    rb_define_method(mExtMath,"fabs",extm_fabs,1);
-    rb_define_method(mExtMath,"cbrt",extm_cbrt,1);
-    rb_define_method(mExtMath,"erf",extm_erf,1);
-    rb_define_method(mExtMath,"erfc",extm_erfc,1);
-    rb_define_method(mExtMath,"j0",extm_j0,1);
-    rb_define_method(mExtMath,"j1",extm_j1,1);
-    rb_define_method(mExtMath,"jn",extm_jn,2);
-    rb_define_method(mExtMath,"y0",extm_y0,1);
-    rb_define_method(mExtMath,"y1",extm_y1,1);
-    rb_define_method(mExtMath,"yn",extm_yn,2);
-    rb_define_method(mExtMath,"expm1",extm_expm1,1);
-    rb_define_method(mExtMath,"log1p",extm_log1p,1);
-    rb_define_method(mExtMath,"hypot",extm_hypot,2);
+    rb_define_module_function(mExtMath,"lgamma",extm_lgamma,1);
+    rb_define_module_function(mExtMath,"sinh",extm_sinh,1);
+    rb_define_module_function(mExtMath,"cosh",extm_cosh,1);
+    rb_define_module_function(mExtMath,"tanh",extm_tanh,1);
+    rb_define_module_function(mExtMath,"asinh",extm_asinh,1);
+    rb_define_module_function(mExtMath,"acosh",extm_acosh,1);
+    rb_define_module_function(mExtMath,"atanh",extm_atanh,1);
+    rb_define_module_function(mExtMath,"ceil",extm_ceil,1);
+    rb_define_module_function(mExtMath,"floor",extm_floor,1);
+    rb_define_module_function(mExtMath,"fabs",extm_fabs,1);
+    rb_define_module_function(mExtMath,"cbrt",extm_cbrt,1);
+    rb_define_module_function(mExtMath,"erf",extm_erf,1);
+    rb_define_module_function(mExtMath,"erfc",extm_erfc,1);
+    rb_define_module_function(mExtMath,"j0",extm_j0,1);
+    rb_define_module_function(mExtMath,"j1",extm_j1,1);
+    rb_define_module_function(mExtMath,"jn",extm_jn,2);
+    rb_define_module_function(mExtMath,"y0",extm_y0,1);
+    rb_define_module_function(mExtMath,"y1",extm_y1,1);
+    rb_define_module_function(mExtMath,"yn",extm_yn,2);
+    rb_define_module_function(mExtMath,"expm1",extm_expm1,1);
+    rb_define_module_function(mExtMath,"log1p",extm_log1p,1);
+    rb_define_module_function(mExtMath,"hypot",extm_hypot,2);
 }
--- extmath-t-nissie-01.patch end -------------------------------------

-- 
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 NISHIMATSU Takeshi   [e-mail] OR [e-mail]
 西松 毅