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MtSrand

Script function

world.MtSrand

Read about scripting

Type

Method

Summary

Seed the Mersenne Twister pseudo-random number generator

Prototype

void MtSrand(long Seed);

View list of data type meanings

Description

This seeds the MT generator with the given number, which is a 32-bit number.


Available in MUSHclient version 3.57 onwards.



VBscript example

MtSrand 12345


Jscript example

MtSrand (12345)


Lua example

MtSrand (12345)

MtSrand { 88, 44, 95, 1234, 82343, 44853454 } -- see remarks below


Lua notes

You can also seed the Mersenne Twister with a table of seeds, rather than a single number. 

This is because, although the MT generator has a period of 2^19937-1 (that is, the number of iterations before it repeats itself), the initial seeding is only a single number of 2^32 bits. 

Thus there are effectively only 2^32 (4294967296) possible starting states for the generator. 

However by initialising with an array of seeds you can effectively seed the generator to many different states.

The restrictions on using the array of seeds are:

* It only applies to Lua
* The seeds must be numbers (or convertible to numbers)
* There must be at least one number
* They must be an ordinary Lua vector-style table. That is, the key of the first seed is 1, the key of the second is 2, and so on.
* The seed numbers should be integers in the range 0 to 4294967296

Example:

t = { 1234, 5678, 9876, 5432 }
MtSrand (t) -- seed with table of seeds
MtSrand (8888) -- seed with single seed

The MT internal state consists of a vector of 624 32-bit numbers. 

You can supply any size table, if it is less than 624 entries, effectively the ones you supply are repeated through the state table. 

If you supply more they will be XOR'd with the earlier values. Probably 624 numbers is the maximum useful amount you can supply.


Return value

Nothing.


See Also ...

Topics

Scripting
Utilities

Functions

(AddFont) Adds a custom font for use by MUSHclient
(Base64Decode) Takes a base-64 encoded string and decodes it.
(Base64Encode) Encodes a string using base-64 encoding.
(BlendPixel) Blends a single pixel with another, using a specified blending mode
(ChangeDir) Changes the MUSHclient working directory
(CreateGUID) Creates a GUID - Global Unique Identifier
(EditDistance) Returns the Levenshtein Edit Distance between two words
(ErrorDesc) Converts a MUSHclient script error code into an human-readable description
(ExportXML) Exports a world item in XML format
(FilterPixel) Performs a filtering operation on one pixel
(FixupEscapeSequences) Converts "escape sequences" like \t to their equivalent codes.
(FixupHTML) Fixes up text for writing as HTML
(FlashIcon) Flashes the MUSHclient icon on the Windows taskbar
(GenerateName) Generates a random character name
(GetClipboard) Gets the clipboard contents
(GetScriptTime) Returns the amount of time spent in script routines
(GetSoundStatus) Gets the status of a sound started by PlaySound
(GetUniqueID) Creates a unique ID for general use, or for making Plugin IDs
(GetUniqueNumber) Returns a unique number
(Hash) Produces a hash (checksum) of a specified piece of text
(Help) Shows help for a script function, or a list of functions
(ImportXML) Imports configuration data in XML format
(Menu) Creates a pop-up menu inside the command window
(Metaphone) Returns the metaphone code for the supplied word
(MoveMainWindow) Move and resize the main MUSHclient window
(MoveWorldWindow) Move and resize a world window
(MoveWorldWindowX) Move and resize a specific world window
(MtRand) Returns pseudo-random number using the Mersenne Twister algorithm
(PlaySound) Plays a sound using DirectSound
(ReadNamesFile) Loads in a file for generating character names
(Replace) Replaces one substring with another
(SetBackgroundColour) Sets a background colour for the output window
(SetBackgroundImage) Sets a background image for the output window
(SetClipboard) Sets the clipboard contents
(SetForegroundImage) Sets a foreground image for the output window
(SetMainTitle) Sets the main output window title
(SetStatus) Sets the status line text
(SetTitle) Sets the world window title
(SetToolBarPosition) Sets the position of the game toolbars on the screen.
(ShiftTabCompleteItem) Adds an item to the list shown for Shift+Tab completion
(Simulate) Simulate input from the MUD, for debugging purposes
(Sound) Plays a sound
(StopSound) Stop playing a sound started by PlaySound
(StripANSI) Strips ANSI colour sequences from a string
(Trace) Trace mode property
(TraceOut) Outputs the supplied message to the world Trace
(TranslateDebug) Sends a debugging message to the localizing translator script
(TranslateGerman) Translate German umluat sequences
(Transparency) Sets the transparency of the main MUSHclient window under Windows XP
(Trim) Trims leading and trailing spaces from a string

(Help topic: function=MtSrand)

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