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bigdecimal
/ jacobian (32018.0) -
ヤコビ行列を計算する機能を提供します。
...ヤコビ行列を計算する機能を提供します。
実行例:
require "bigdecimal"
require "bigdecimal/jacobian"
...
dfdx = Jacobian.jacobian(f,fx,x)
引数 f には関数を表すオブジェクトを指定します。以下のメソッドに応答でき
る必要があります.......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 fx には f.values(x) の結果を指定します。
引数... -
bigdecimal (26228.0)
-
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
/ newton (26018.0) -
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
/ util (26018.0) -
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。... -
bigdecimal
/ math (26012.0) -
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
//}... -
base64 (26006.0)
-
Base64 エンコード / デコードを行うメソッドを定義したモジュールを提供するライブラリです。
...Base64 エンコード / デコードを行うメソッドを定義したモジュールを提供するライブラリです。
Base64 は、3 オクテット (8bits * 3 = 24bits) のバイナリコードを
ASCII 文字のうちの 65 文字 ([A-Za-z0-9+/] の 64 文字と '=')
だけを使用し......て 4 オクテット (6bits * 4 = 24bits)
の印字可能文字列に変換するエンコーディング法です。
2045, 4648 で定義されています。
このライブラリは 1.8 系統に添付されていた base64 ライブラリとは違います。
もはやサンプルスクリプ......=== 使用方法
require "base64"
enc = Base64.encode64('Send reinforcements')
# => "U2VuZCByZWluZm9yY2VtZW50cw==\n"
plain = Base64.decode64(enc)
# => "Send reinforcements"
データをエンコードするために Base64 エンコー... -
IRB
:: ExtendCommand :: Require (21016.0) -
irb 中の irb_require コマンドのための拡張を定義したクラスです。
...irb 中の irb_require コマンドのための拡張を定義したクラスです。... -
Gem
:: Specification # required _ ruby _ version -> Gem :: Requirement (12300.0) -
この Gem パッケージを動作させるのに必要な Ruby のバージョンを返します。
...この Gem パッケージを動作させるのに必要な Ruby のバージョンを返します。... -
Gem
:: Specification # required _ ruby _ version=(requirement) (12300.0) -
この Gem パッケージを動作させるのに必要な Ruby のバージョンをセットします。
...この Gem パッケージを動作させるのに必要な Ruby のバージョンをセットします。
@param requirement Gem::Requirement.create が受け付ける形式のオブジェクトを指定します。
@see Gem::Requirement...