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検索結果
-
bigdecimal (26252.0)
-
bigdecimal は浮動小数点数演算ライブラリです。 任意の精度で 10 進表現された浮動小数点数を扱えます。
...bigdecimal は浮動小数点数演算ライブラリです。
任意の精度で 10 進表現された浮動小数点数を扱えます。
//emlist[][ruby]{
require 'bigdecimal'
a = BigDecimal("0.123456789123456789")
b = BigDecimal("123456.78912345678", 40)
print a + b # => 0.123456912580245903456......、BigDecimal では正確な値を得る事ができます。
//emlist[例1: 0.0001 を 10000 回足す場合。][ruby]{
sum = 0
for i in (1..10000)
sum = sum + 0.0001
end
print sum # => 0.9999999999999062
//}
//emlist[例2: 0.0001 を 10000 回足す場合。(BigDecimal)][ruby]{
require 'bigde......cimal'
sum = BigDecimal("0")
for i in (1..10000)
sum = sum + BigDecimal("0.0001")
end
print sum # => 0.1e1
//}
//emlist[例3: 1.2 - 1.0 と 0.2 との比較][ruby]{
require "bigdecimal"
(BigDecimal("1.2") - BigDecimal("1.0")) == BigDecimal("0.2") # => true
(1.2 - 1.0) == 0.2 # => false
//}
==... -
bigdecimal
/ ludcmp (26034.0) -
LU 分解を用いて、連立1次方程式 Ax = b の解 x を求める機能を提供します。
...LU 分解を用いて、連立1次方程式 Ax = b の解 x を求める機能を提供します。
Ruby のソースコード中の以下のサンプルスクリプトも参考にしてください。
* https://github.com/ruby/ruby/blob/master/ext/bigdecimal/sample/linear.rb... -
bigdecimal
/ newton (26024.0) -
ニュートン法を用いて非線形方程式 f(x) = 0 の解 x を求める機能を提供しま す。
...非線形方程式 f(x) = 0 の解 x を求める機能を提供しま
す。
本サブライブラリは BigDecimal に依存しません。
実行例:
require "bigdecimal"
require "bigdecimal/newton"
...
n = Newton.nlsolve(f, x)
引数 f には関数を表すオブジェクトを指.......eps
収束の基準になる epsilon 値を返します。2 つの値が異なる値かどうかを比
較するのに使用されます。|a - b| < f.eps となる 2 つの値は同じ値である
とみなされます。
引数 x には探索を開始する点を数値の配列で指定......変更されます。x から解を取得します。
戻り値 n は計算した回数を整数で返します。
Ruby のソースコード中の以下のサンプルスクリプトも参考にしてください。
* https://github.com/ruby/ruby/blob/master/ext/bigdecimal/sample/nlsolve.rb... -
bigdecimal
/ math (26006.0) -
BigDecimalを使った数学的な機能を提供します。
...BigDecimalを使った数学的な機能を提供します。
以下の計算が行えます。
* sqrt(x, prec)
* sin (x, prec)
* cos (x, prec)
* atan(x, prec)
* PI (prec)
* E (prec)
引数:
: x
計算対象の BigDecimal オブジェクト。
: prec
計算結果の精度。
//e......mlist[例][ruby]{
require "bigdecimal"
require "bigdecimal/math"
include BigMath
a = BigDecimal((PI(100)/2).to_s)
puts sin(a,100)
#=> 0.99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998765917571575217785e0
//}... -
bigdecimal
/ util (26006.0) -
String、Integer、Float、Rational, NilClass オブジェクトを BigDecimal オブジェクトに変換する機能を提供します。
...ェクトを
BigDecimal オブジェクトに変換する機能を提供します。
* String#to_d
* Integer#to_d
* Float#to_d
* Rational#to_d
これらのメソッドを使うには 'bigdecimal/util' を require する必要があります。
なお、Ruby 2.6.0 以降では、'bigdecimal/u......til' を require すると、
'bigdecimal' 本体も require されます。......を
BigDecimal オブジェクトに変換する機能を提供します。
* String#to_d
* Integer#to_d
* Float#to_d
* Rational#to_d
* NilClass#to_d
これらのメソッドを使うには 'bigdecimal/util' を require する必要があります。
なお、Ruby 2.6.0 以降では、'bigd......ecimal/util' を require すると、
'bigdecimal' 本体も require されます。... -
FileUtils
# ruby(*args) {|result , status| . . . } (24229.0) -
与えられた引数で Ruby インタプリタを実行します。
...与えられた引数で Ruby インタプリタを実行します。
@param args Ruby インタプリタに与える引数を指定します。
例:
ruby %{-pe '$_.upcase!' <README}
@see Kernel.#sh... -
Gem
. # ruby -> String (24217.0) -
実行中のRubyインタプリタのパスを返します。
...実行中のRubyインタプリタのパスを返します。... -
RbConfig
. ruby -> String (24217.0) -
ruby コマンドのフルパスを返します。
...
ruby コマンドのフルパスを返します。... -
String
# b -> String (18113.0) -
self の文字エンコーディングを ASCII-8BIT にした文字列の複製を返します。
...self の文字エンコーディングを ASCII-8BIT にした文字列の複製を返します。
//emlist[例][ruby]{
'abc123'.encoding # => #<Encoding:UTF-8>
'abc123'.b.encoding # => #<Encoding:ASCII-8BIT>
//}...