rdoc update.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

math.c

@@ -600,38 +600,37 @@ math_erfc(VALUE obj, VALUE x)
  *
  *  Calculates the gamma function of x.
  *
- *  Note that gamma(n) is same as fact(n-1) for integer n >= 0.
+ *  Note that gamma(n) is same as fact(n-1) for integer n > 0.
  *  However gamma(n) returns float and possibly has error in calculation.
  *
  *   def fact(n) (1..n).inject(1) {|r,i| r*i } end
- *   0.upto(25) {|i| p [i, Math.gamma(i+1), fact(i)] }
- *   #=>
- *   [0, 1.0, 1]
- *   [1, 1.0, 1]
- *   [2, 2.0, 2]
- *   [3, 6.0, 6]
- *   [4, 24.0, 24]
- *   [5, 120.0, 120]
- *   [6, 720.0, 720]
- *   [7, 5040.0, 5040]
- *   [8, 40320.0, 40320]
- *   [9, 362880.0, 362880]
- *   [10, 3628800.0, 3628800]
- *   [11, 39916800.0, 39916800]
- *   [12, 479001600.0, 479001600]
- *   [13, 6227020800.0, 6227020800]
- *   [14, 87178291200.0, 87178291200]
- *   [15, 1307674368000.0, 1307674368000]
- *   [16, 20922789888000.0, 20922789888000]
- *   [17, 355687428096000.0, 355687428096000]
- *   [18, 6.402373705728e+15, 6402373705728000]
- *   [19, 1.21645100408832e+17, 121645100408832000]
- *   [20, 2.43290200817664e+18, 2432902008176640000]
- *   [21, 5.109094217170944e+19, 51090942171709440000]
- *   [22, 1.1240007277776077e+21, 1124000727777607680000]
- *   [23, 2.5852016738885062e+22, 25852016738884976640000]
- *   [24, 6.204484017332391e+23, 620448401733239439360000]
- *   [25, 1.5511210043330954e+25, 15511210043330985984000000]
+ *   1.upto(26) {|i| p [i, Math.gamma(i), fact(i-1)] }
+ *   #=> [1, 1.0, 1]
+ *   #   [2, 1.0, 1]
+ *   #   [3, 2.0, 2]
+ *   #   [4, 6.0, 6]
+ *   #   [5, 24.0, 24]
+ *   #   [6, 120.0, 120]
+ *   #   [7, 720.0, 720]
+ *   #   [8, 5040.0, 5040]
+ *   #   [9, 40320.0, 40320]
+ *   #   [10, 362880.0, 362880]
+ *   #   [11, 3628800.0, 3628800]
+ *   #   [12, 39916800.0, 39916800]
+ *   #   [13, 479001600.0, 479001600]
+ *   #   [14, 6227020800.0, 6227020800]
+ *   #   [15, 87178291200.0, 87178291200]
+ *   #   [16, 1307674368000.0, 1307674368000]
+ *   #   [17, 20922789888000.0, 20922789888000]
+ *   #   [18, 355687428096000.0, 355687428096000]
+ *   #   [19, 6.402373705728e+15, 6402373705728000]
+ *   #   [20, 1.21645100408832e+17, 121645100408832000]
+ *   #   [21, 2.43290200817664e+18, 2432902008176640000]
+ *   #   [22, 5.109094217170944e+19, 51090942171709440000]
+ *   #   [23, 1.1240007277776077e+21, 1124000727777607680000]
+ *   #   [24, 2.5852016738885062e+22, 25852016738884976640000]
+ *   #   [25, 6.204484017332391e+23, 620448401733239439360000]
+ *   #   [26, 1.5511210043330954e+25, 15511210043330985984000000]
  *
  */