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Random

擬似乱数を生成

Random, OutputVar [, Min, Max]
Random,,NewSeed

Parameters

引数名説明
OutputVar 結果の出力先の変数名。
浮動小数点数の表現形式はSetFormatコマンドで設定できる。
Min 結果の最小値。
省略時は「0」
負の値も可能。
整数の場合、「-2147483648」まで可能。
小数の場合、下限は無い。
Max 結果の最大値。
省略時は「2147483648」
整数の場合、「2147483648」まで可能。
小数の場合、下限は無い。
NewSeed 第1引数を省略して第2引数に数値を指定した場合、乱数生成に使用されるシードを設定できる。
同じシードを設定して同じようにRandomコマンドを実行した場合、得られる値は必ず同じになる。
例えば、以下のスクリプトは、何度実行しても必ず同じ表示になる。
Random,,1000
Loop,10{
	Random,r,0,10000
	s=%s%%r%`n
}
MsgBox,%s%
スクリプト開始時は、100ナノ秒単位の現在時刻を表す数値がシードに使われる。

Remarks

MinとMaxで設定した数の間にあるランダムな数値をOutputVar変数に格納する。

MaxかMinに小数点を含む数値が指定された場合、結果はSetFormatコマンドで設定したフォーマットの小数になる。
それ以外の場合は、整数になる。

Related

SetFormat

Example(s)

Random, rand, 1, 10

Random, rand, 0.0, 1.0

Comments based on the original source

This function uses the Mersenne Twister random number generator, MT19937, written by Takuji Nishimura and Makoto Matsumoto, Shawn Cokus, Matthe Bellew and Isaku Wada.

The Mersenne Twister is an algorithm for generating random numbers. It was designed with consideration of the flaws in various other generators. The period, 219937-1, and the order of equidistribution, 623 dimensions, are far greater. The generator is also fast; it avoids multiplication and division, and it benefits from caches and pipelines. For more information see the inventors' web page at http://www.math.keio.ac.jp/~matumoto/emt.html

Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  3. The names of its contributors may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Do NOT use for CRYPTOGRAPHY without securely hashing several returned values together, otherwise the generator state can be learned after reading 624 consecutive values.

When you use this, send an email to: matumoto@math.keio.ac.jp with an appropriate reference to your work. It would be nice to CC: rjwagner@writeme.com and Cokus@math.washington.edu when you write.

This above has been already been done for AutoHotkey, but if you use the Random command in a publicly distributed application, consider sending an e-mail to the above people to thank them for their efforts and generosity.

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