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rdoc update.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2009-05-13 10:36:52 +00:00
parent 8265f3125e
commit e7ba39350a
1 changed files with 28 additions and 29 deletions
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57
math.c
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@ -600,38 +600,37 @@ math_erfc(VALUE obj, VALUE x)
* *
* Calculates the gamma function of 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. * However gamma(n) returns float and possibly has error in calculation.
* *
* def fact(n) (1..n).inject(1) {|r,i| r*i } end * def fact(n) (1..n).inject(1) {|r,i| r*i } end
* 0.upto(25) {|i| p [i, Math.gamma(i+1), fact(i)] } * 1.upto(26) {|i| p [i, Math.gamma(i), fact(i-1)] }
* #=> * #=> [1, 1.0, 1]
* [0, 1.0, 1] * # [2, 1.0, 1]
* [1, 1.0, 1] * # [3, 2.0, 2]
* [2, 2.0, 2] * # [4, 6.0, 6]
* [3, 6.0, 6] * # [5, 24.0, 24]
* [4, 24.0, 24] * # [6, 120.0, 120]
* [5, 120.0, 120] * # [7, 720.0, 720]
* [6, 720.0, 720] * # [8, 5040.0, 5040]
* [7, 5040.0, 5040] * # [9, 40320.0, 40320]
* [8, 40320.0, 40320] * # [10, 362880.0, 362880]
* [9, 362880.0, 362880] * # [11, 3628800.0, 3628800]
* [10, 3628800.0, 3628800] * # [12, 39916800.0, 39916800]
* [11, 39916800.0, 39916800] * # [13, 479001600.0, 479001600]
* [12, 479001600.0, 479001600] * # [14, 6227020800.0, 6227020800]
* [13, 6227020800.0, 6227020800] * # [15, 87178291200.0, 87178291200]
* [14, 87178291200.0, 87178291200] * # [16, 1307674368000.0, 1307674368000]
* [15, 1307674368000.0, 1307674368000] * # [17, 20922789888000.0, 20922789888000]
* [16, 20922789888000.0, 20922789888000] * # [18, 355687428096000.0, 355687428096000]
* [17, 355687428096000.0, 355687428096000] * # [19, 6.402373705728e+15, 6402373705728000]
* [18, 6.402373705728e+15, 6402373705728000] * # [20, 1.21645100408832e+17, 121645100408832000]
* [19, 1.21645100408832e+17, 121645100408832000] * # [21, 2.43290200817664e+18, 2432902008176640000]
* [20, 2.43290200817664e+18, 2432902008176640000] * # [22, 5.109094217170944e+19, 51090942171709440000]
* [21, 5.109094217170944e+19, 51090942171709440000] * # [23, 1.1240007277776077e+21, 1124000727777607680000]
* [22, 1.1240007277776077e+21, 1124000727777607680000] * # [24, 2.5852016738885062e+22, 25852016738884976640000]
* [23, 2.5852016738885062e+22, 25852016738884976640000] * # [25, 6.204484017332391e+23, 620448401733239439360000]
* [24, 6.204484017332391e+23, 620448401733239439360000] * # [26, 1.5511210043330954e+25, 15511210043330985984000000]
* [25, 1.5511210043330954e+25, 15511210043330985984000000]
* *
*/ */